How to fix Marshmallow-related problems on Galaxy S6 series, deleted emails keeps coming back to inbox, other issues


S6 Marshmallow

While Android #Marshmallow is well regarded compared to Lollipop, Google’s new OS is far from perfect. For the past few weeks, we’ve been getting a lot of reports from our readership about the new OS causing problems. This post discusses some of these issues that affect some #GalaxyS6 devices.

  1. Deleted emails on Galaxy S6 keeps coming back to inbox
  2. Galaxy S6 keeps on freezing and restarting on its own
  3. How to fix Marshmallow-related problems on Galaxy S6 series

If you are looking for solutions to your own #Android issue, you can contact us by using the link provided at the bottom of this page, or you can install our free app from Google Play Store.

When describing your issue, please be as detailed as possible so we can easily pinpoint a relevant solution. If you can, kindly include the exact error messages you are getting to give us an idea where to start. If you have already tried some troubleshooting steps before emailing us, make sure to mention them so we can skip them in our answers.


Problem #1: Deleted emails on Galaxy S6 keeps coming back to inbox

Hey TheDroidGuy. I have a Samsung Galaxy S6 (not the Edge one). I have contacted my web and email hosts about this issue, however I am not getting very far.

I have only recently installed a Samsung software update to the phone. Before the update everything email wise was working perfectly.

Now the update is installed, my emails have been coming in and I am able to send emails without any problems (as before). The problem I am having is that when I delete an email on my phone; at the next sync interval, the deleted email comes back into my inbox!!

I am using an IMAP format and my settings etc have not changed. I have deleted the email accounts (x5) and re-introduced them, being meticulous to get all settings, passwords etc etc correct, as per previous.

Is there something I can do without deleting the cache partition and restoring factory default settings please?

Or will this settle down eventually, given a couple of weeks? Many thanks on advance for your advice.

Regards. — Daniel

Solution: Hi Daniel. The best thing that you can do for now is to observe if the issue will continue in the next few days. There may be some sync problems on your email provider’s side preventing the actions of an email client (your device) from being implemented properly.

Keep in mind that email problems may not exactly be due to an issue on your device. There’s only so much that you can do on your end. The troubleshooting the you can do includes wiping the email app’s cache and data, deleting the cache partition, and ultimately, performing a factory reset.  Before you commit to drastic measures though, we recommend that you work with your email provider first to rule out possible server issues. We’re aware that you’ve already contacted them but if you’re paying for their services, they’re obligated to help you fix a problem like this.

Problem #2: Galaxy S6 keeps on freezing and restarting on its own

I have this issue of the phone freezing and restarting. Sometimes it just freezes. I already did a lot of factory reset and cache wiping but it still persist. One time I was playing Fallout Shelter and then Google Play games popped out because I achieved something and then the screen turned kinda like black and white stripes then rebooted. Then it starts freezing randomly. When I open messages, or settings, or when the screen locks, or before the phone shuts down, it freezes and the phone becomes hot as hell.

I’m thinking of updating my phone’s software to 5.1.2 or 5.1.1 (i’m not sure) as I’m currently running 5.0.2. Hoping it can fix it but as I download the OTA it freezes!! 15% of the download. Now i’m thinking how would I update the phone with this problem. I dunno what makes it freeze and restart like that. Phone doesn’t have warranty anymore. The phone’s never been soaked to liquid before. Help please. 🙁 — Aaron

Solution: Hi Aaron. We can point our finger to some known causes of freezing and random restart problems but identifying the exact reason can be tricky. Among the usual culprits include:

  • poor memory (RAM) management
  • network changes and bandwidth limitations
  • malfunctioning processor (CPU)
  • bad app
  • compatibility issues
  • insufficient storage space
  • nonfunctional SD card
  • low capacity battery
  • other hardware errors

Check for Android updates

Finding out which of these things is behind the trouble requires troubleshooting. You can start by making sure that you install the latest software update. We know you’ve already tried it once but we’ll ask you again to do it again. Before you do so though, you have to ensure that your phone boots in safe mode to minimize possible freezing, especially if there’s a chance that a third party app may be to blame. Simply follow these steps in order to boot your phone in safe mode:

  • Press and hold the Volume Down and Power keys for 20 to 30 seconds.
  • Once you see the Samsung logo, release the Power key immediately but continue pressing the Volume Down key.
  • Your phone should continue booting up and you will be prompted to unlock your phone as usual.
  • You will know if the phone successfully booted in safe mode if the text “Safe mode” is displayed at the lower-left corner of the screen.

Delete the cache partition

The cache partition is a repository of system files used by the operating system during app load times. Rather than come up with sets of files to hasten  loading times, your Android device “caches” previously created system files in the cache partition so it can access them easily the next time an app is loaded. In an ideal world, files in the cache partition should be refreshed automatically during an app or system update. This doesn’t happen most of the time though. Sometimes, manually wiping the cache partition is necessary in order to refresh it. Because the files themselves are temporary, they can be deleted safely without impacting the operating system or the apps. The system will automatically create a new set of cache files that next time you load your apps.

Wiping the cache partition has proven effective in fixing minor app-specific issues as well as freezing and random reboot issues. If you haven’t done this step yet, simply follow these steps:

  • Turn off the device.
  • Press and hold the following three buttons at the same time: Volume Up key, Home key, and Power key.
  • When the phone vibrates, release the Power key but continue to press and hold the Volume Up key and the Home key.
  • When the Android System Recovery screen appears, release the Volume Up and Home keys.
  • Press the Volume Down key to highlight ‘wipe cache partition.’
  • Press the Power key to select.
  • When the wipe cache partition is complete, ‘Reboot system now’ is highlighted.
  • Press the Power key to restart the device.


Clear app cache and data

This troubleshooting step goes hand in hand with wiping the cache partition, albeit for targeted apps only. If the issue appears to be limited to a specific app only, deleting its cache and data may easily fix the problem for you. Here’s how it’s done:

  • Go to Settings.
  • Proceed to Applications.
  • Select Manage Applications.
  • Tap the All tab.
  • Choose the name of the app that has been going rogue.
  • From there, you will see the Clear Cache and Clear Data buttons.

Uninstall apps

Many Android users think that updating the operating system also means apps are automatically updated in the process. The truth is quite the opposite. Improperly coded apps can lead to a variety of problems so make sure that you only install official, and regularly updated apps. Not every developer is keen enough to update their product and/or fix bugs when new OS updates are released. If you have unused apps sitting idly for over two weeks, chances are it’s not necessary. Keep the number of your apps as slim as possible and remember to stick to products built by reputable developers.

Perform a master reset

Nobody wants to do this but if nothing seems to work, you really have no other choice in terms of troubleshooting left. Restoring firmware and app settings back to defaults may eliminate bugs that developed after installing third party apps or updates over time. Here’s how it’s done:

  • Turn off your Samsung Galaxy S6 Edge.
  • Press and hold the Volume Up, Home and Power keys together.
  • When the device powers on and displays ‘Power on logo’, release all keys and the Android icon will appear on the screen.
  • Wait until the Android Recovery Screen appears after about 30 seconds.
  • Using the Volume Down key, highlight the option, ‘wipe data/factory reset’ and press the Power key to select it.
  • Press the Volume Down button again until the option ‘Yes — delete all user data’ is highlighted and then press the Power key to select it.
  • After the reset is complete, highlight ‘Reboot system now’ and hit the Power key to restart the phone.

Time for hardware checkup

If the problem persists after doing all of the above, you can safely assume that a hardware issue may be to blame. At times, a damaged battery can make the phone lose power in a very short time. Because the S6 has a non-removable battery pack, you must let a professional or Samsung do some checks on it. Bear in mind that a faulty processor can also result to freezing or random reboot issues and diagnosing it can be a difficult business. If you suspect that some internal components is to blame other than the battery, finding a way to have the phone replacement is always better than having the device repaired.

Problem #3: How to fix Marshmallow-related problems on Galaxy S6 series

Since Marshmallow was pushed to my phone my email will not sync both ways.  If I receive an email it will appear on both my phone and my laptop.  If I delete if from my S6 it will delete it from my laptop.  If I delete from my laptop it will not delete from my phone unless I manually delete it.  Everything worked fine before the new software.  I have talked with Sprint, CenturyLine (my email carrier) and Samsung.  They all have no clue as to why this is happening. I have hard rebooted my phone, Sprint has reacquired my phone and have cleared the cache. — Mike


Received the Marshmallow update two days ago, now my voicemail number is linked to my daughters phone number on my account.  When calling her number, it’s labeled Voicemail.  Also, when receiving MMS messages, when I reply, it adds my daughters number to the messaging and it looks like she is the one replying to the text thread.  Not sure if any of my other contacts are linked together. — Valarie


Hello! I am writing from Europe. Here they’ve just released the latest update 6.0.1 which I’ve done for my S6. I had a few problems at the beginning which I’ve managed to solve except one: I set a photo from my gallery as home and lockscreen and anytime I restart the phone it’s gone. The display goes back to the pinkish/blue default Samsung background for the lock screen and the blue one for the home screen. Any suggestion? I wouldn’t want to make a factory reset for such a silly issue…

thanks in advance! — Barbara


My phone was recently updated to Android 6.0.1 and now my email is not syncing correctly, I am syncing to my work email through Exchange Server.  Before the update my phone had no issues receiving and sending email but now it doesn’t seem to be working correctly.  I have check all setting and they are the same as they were before.  I am wondering if I need to uninstall my Exchange account and reinstall it to see if that will work.

Thanks. — Don


I’ve recently updated to marshmallow. But since the update my S6 is so slow. Weather I’m browsing using wifi or without. And using my phone in general e.g messing, openings contacts list to make call, email etc. Keeps lagging. Response is so so slow from my phone. Can take upto 10secs to complete an action. Is there anything i can do to make my phone normal again? 🙁

Thank you. — Salma


My phone forced me to do the marshmallow update. Now I have to swipe the screen prior to using my pattern to login. (I have kids and this can be difficult when I am doing things one handed.) It also changed my email so I can’t just swipe across the email to send it to trash. I have to check the box next to the email in order to delete it. Swiping it gives a menu or will open the email. Is there any way to disable the extra login screen and change the email back to deleting with a single swipe of the message? I have tried to find it in the settings menu and haven’t been able to find a fix. Thank you! — Dana

Solution: Hi Guys. Post-Marshmallow update issues on the S6 are mounting fast during the last few weeks so addressing them in bulk in this post looks reasonable enough. Although it may appear that each problem may be separate from each other, the reason why they’re happening in the first place lies in the fact that they were triggered by installing Android Marshmallow. This doesn’t mean that Google’s new operating system itself is purely to blame. There are many other variables that can come into play when running a developing operating system. The interaction of Marshmallow with other apps that may or may not be optimized to work with it can create a lot of possible points of failure. It’s not surprising that average users will right away blame the new operating system as the villain.

Fortunately, fixing whatever problem you may be getting following any Android update is easy enough in most cases. In general, the basic software troubleshooting steps like the ones outlined above can effectively counter most update-related problems. Those issues that remain after wiping the cache partition or doing a factory reset are most likely app-related, which means that either they’re poorly coded, or their developer did not bother updating it to work with the new OS. As mentioned above, not all developers see the need to ensure that their product works in harmony with the new OS. In fact, a big chunk of available apps in Google Play Store right now are still not optimized to work with Marshmallow because developers simply don’t care. An app designed to work with Android KitKat or Lollipop does not necessarily mean to work smoothly with Marshmallow. If you are an early adapter or Marshmallow, or if your wireless carrier “forced” the update to your device, make sure that all your apps are fully updated. Don’t hesitate to temporarily uninstall an outdated app, especially if you’re having problems after installing Marshmallow.

As a general rule of thumb, make sure that you wipe the cache partition and do a factory reset after a major update. Please check this post for more discussions about Android Marshmallow.


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2 Replies to “How to fix Marshmallow-related problems on Galaxy S6 series, deleted emails keeps coming back to inbox, other issues”

  1. Actually there’s a solution, turn off APP OPTIMIZATION that appeared after the update. Solved my problem in seconds. Nothing was syncing not just gmail, everything had to be synced manually or would sync once if phone was just turned on. Try turning off app optimization (worked for Samsung Galaxy Note 4)

  2. I need help. Marshmallow updated onto my phone and now the swipe pattern doesn’t work and am locked out. I have Sprint, Samsung S6 it is saying wrong pattern 1 hour wait time between, it is the correct pattern prior to going from lollipop to marshmallow android 6.0.1 gives you option to enter backup pin which I am entering correct back up pin & not working either. Lollipop used to let you use google back up password but marshmallow doesn’t. I will not factory reset as I know one day (hopefully today) there will be a work around. Tried find my device through samsung but it isn’t compatible with sprint. Tried google android device manager, to reset password, it says phone is already locked. So no simple way to crack through but I am hoping someone out there can give me the fix.

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