Samsung Galaxy S6 keeps restarting, stuck in a boot loop & other system issues

Based on reports we received from our readers, there are several reasons why the Samsung Galaxy S6 (#Samsung #GalaxyS6) gets stuck in a boot loop or keeps restarting. Firmware updates and app crashes, however, are the most common causes since a lot of things get changed and upgraded. These are your starting point when troubleshooting boot loop and reboot issues. Continue reading to learn how to tackle these problems.


Here’s the list of the issues I covered in this post…

For those who are seeking solutions for different issues, visit our S6 troubleshooting page where we list down every issue we address. Find ones that are related to yours and use the solutions we suggested. If they won’t work for you, then fill up this questionnaire and hit Submit to contact us.

Galaxy S6 got stuck in a boot loop

Problem: My phone is stuck in a boot loop. I had not recently downloaded any apps. My phone was full and needed to be emptied but other than that there were no issues until this morning and it has been in a boot loop all day. I just want to get to a place where I can get my pictures off the phone.  Please respond asap. Thank you!

Troubleshooting: Isolate the problem immediately. Boot the phone in safe mode to see if it could get out of the boot loop.

  1. Turn off your Galaxy S6.
  2. Press and hold the Power key.
  3. When ‘Samsung Galaxy S6 Edge’ appears, immediately release the Power key and then press and hold the Volume Down button.
  4. Continue holding the Volume Down button until the phone finishes the restart.
  5. When you see Safe Mode on the lower left corner of the screen, release the button.

Should the problem remain even in safe mode, then wipe the cache partition. Based on your description, these are the only procedures you can try to fix the issue:

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

If these procedures failed, then you really have to reset your phone but it also means you can’t recover your photos and files.

Galaxy S6 showing “Downloading…Do not turn off target”

Problem: Phone updated on its own. Phone then started making funny sounds. I tried to shut phone down. Phone shut off then a blue screen came up.  States downloading with an arrow and says do not turn off target.  Tried holding vol. down button, power button and home at same time. Tried holding power button for a long time. Nothing is working. Phone has been like this over an hour.  Sending this from husbands phone.  Can you help me? Thank you, Linda.

Troubleshooting: Hey Linda. The screen you’re seeing is called “Download Mode” otherwise known as “Odin Mode.” The device needs to be restarted in that mode if you want to flash or manually install a firmware, which in your case, isn’t necessary. And since normal reboot won’t work, try doing the force restart: press and hold the Volume Down and Power buttons together for 20 seconds. The phone will perform the simulated battery pull and will force reboot your phone. That should do it.

Galaxy S6 reverts back to swipe lock

Problem: I just bought the Galaxy S6 on Monday. Since the first day,  the security screen lock setting keeps getting reset from pin or pattern to swipe.  I’ve been through troubleshooting and even swapped out for a brand new phone.  They both do the same thing. How do I fix this?

Troubleshooting: It seems like the additional security feature of the device is bugging you. Try going to Apps > Settings > Lock screen and security > tap Secure lock settings. Disable all options under this menu especially the Smart Lock. So far, this is the only thing I can think of that may cause the kind of problem you currently have. You might want to read my previous posts that dealt with this kind of problem here and here. I hope this helps.

Galaxy S6 keeps saying it’s overheating

Problem: The phone was dropped on the beach. It got a little water in the speaker area of the phone. Let it dry out for a while. Turned it back on and the phone said it was overheating. Now phone can’t charge-keeps saying overheating and turns off.

Answer: Unfortunately, for this kind of problem, you will need an authorized technician to do some tests. While it is obvious water has gotten its way into the device, we don’t know the extent of the damage but based on your description, it seems like the power IC has been affected. Just send it in for repair so you’d know if it could be repaired or needs replacement.

Transferred contacts lacking some information

Problem: I transferred my contacts from my BB Bold to the device easily thru Bluetooth but I didn’t get all my notes in my contacts and the ones I did I can’t change them after pushing Edit button. This is a huge issue as I have thousands of contacts with notes…Please help.

Answer: We might be able to help you easier if you provided more information about this problem. I understand you transferred your contacts from one phone to the new one through Bluetooth but did you transfer them one by one, sync your devices, or what?

But anyway, the most efficient way to transfer contacts without lacking information is to export them to a file with a universal extension (such as .VCF) because it can easily be read and decoded even by new devices. After the export, just copy the file to your new phone and import it. I hope this information can shed some light to your problem.

Galaxy S6 won’t work without apparent reason

Problem: I sent a message using messenger placed it on the table went back to use it five minutes later and doesn’t work. It won’t accept the charger and won’t work. I don’t want to try take battery out and think I’ll go to my provider tomorrow.

Solution: Have you heard about the so-called “system crash?” It does sound like your phone suffered from it. I don’t know exactly what caused the crash but more often, it’s the apps. But whatever the cause was, the only way you can make the phone to work again is to perform the force restart or simulated battery disconnect. Just press and hold the Volume Down and Power buttons together for 20 seconds and your device will reboot and that’s pretty much it!

Galaxy S6 always crashes when apps are launched

Problem: My phone is always crashing whenever I open applications. It’s so hard to use it because I can’t even perform anything because it’s always crashing.

Troubleshooting: We understand that your phone crashes when apps are opened but it could have been easier for us to troubleshoot this problem if you included the name of apps that caused your phone to act crazy. Apparently, the cause of the problem is the apps and to isolate the issue, you need to boot your phone in safe mode:

  1. Turn off your Galaxy S6.
  2. Press and hold the Power key.
  3. When ‘Samsung Galaxy S6’ appears, immediately release the Power key and then press and hold the Volume Down button.
  4. Continue holding the Volume Down button until the phone finishes the restart.
  5. When you see Safe Mode on the lower left corner of the screen, release the button.

While in this mode, try to open the apps that often cause the phone to crash or observe closely to know if the phone still crashes even if all third-party apps are disabled. If so, it’s an issue with the firmware and you need to do the master reset but before that, try everything you can to backup all your data and files as they will all be deleted during the process.

How to master reset Galaxy S6

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

Galaxy S6 showing “Unfortunately, System UI has stopped” error

Problem: I connected my Samsung S6 phone to a wireless network and it showed me I had an update. After the update the phone rebooted completely but I got an error message saying “Unfortunately, System UI has stopped working.” I can’t access the phone anymore. Please help.

Troubleshooting: There are a lot of factors that may lead to this problem and we can’t go after them one by one, instead, we can do a couple of general troubleshooting procedures. The first thing you need to do is wipe the cache partition since the issue occurred immediately after an update. It deletes all system caches forcing the device to create new files. Please refer to the first problem for the instructions on how to wipe the cache partition and if this procedure failed, you have no choice but to do the master reset.

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