How to fix Samsung Galaxy Note 4 that freezes when answering a call & performance issues

Performance related issues are among the most common problems Samsung Galaxy Note 4 (#Samsung #GalaxyNote4) owners reported after the lollipop update. We have received a lot of them so I will include several related problems and questions in this post. If you’re one of the owners and are currently experiencing sluggishness, lags, freezes, random reboots, overheating, etc., I suggest you take time to read this article.


The first problem I addressed is about a Note 4 that freezes when the owner unlocks or answers calls. If the phone is having a difficult time executing very basic functions, there must be something wrong with it considering it is a very powerful phone.

The second problem is still related but this time it’s the Facebook app that keeps freezing. It’s just an app issue but what we actually don’t know is if it’s a firmware problem causing the freezes or an app issue that needs attention from its developer.

Just before we go any further, if you have other problems with your phone, don’t hesitate to contact us by filling up this form as we are always willing to help. Meanwhile, you may visit the troubleshooting page we’ve setup for the Galaxy Note 4 as it contains hundreds of problems we already addressed in the past.

Galaxy Note 4 freezes when answering a call

Problem: Hello droid guy! Love your advice and it has helped me in the past. Recently my Note 4 has been freezing when I try to unlock my phone or when I try to answer a call. Sometimes it will appear that I answer the call but only hear silence and the other person cannot hear me. It has become very annoying. This happens frequently but sporadically. I was using the stock touchwiz then went to Google now launcher with no change, then tried buzz and nova launcher with no change. I have done a soft and factory reset with no change. Help! — Laura

Troubleshooting: Hello Laura. I will try to make this troubleshooting very simple for you. The first thing I want you to do is isolate the problem right away. That means that you need to boot your phone in safe mode and see if the problem still occurs or not.

  1. Turn off the phone completely.
  2. Press and hold the Power key and the Volume Down key.
  3. When the phone starts to boot, release the Power key but continue holding the Vol Down key until the phone finished restarting.
  4. Safe mode will be displayed at the lower left corner; you may release the Volume Down key now.

If the problem persists in safe mode, then backup your data and perform master reset. In case the issue is fixed in safe mode but you don’t know which app is causing the problem, then do the same thing.

Master Reset

  1. Turn off the Galaxy Note 4 completely.
  2. Press and hold the Volume Up and the Home keys together, then press and hold the Power key.
  3. When the Note 4 vibrates, release both the Home and Power keys but continue holding the Volume Up key.
  4. When the Android System Recovery shows on the screen, release the Vol Up key.
  5. Using the Volume Down key, highlight ‘wipe data / factory reset’ and press the Power key to select it.
  6. Now highlight ‘Yes — delete all user data’ using the Vol Down key and press the Power key to begin the reset.
  7. When the master reset is complete, highlight ‘Reboot system now’ and hit the Power key.
  8. The Note 4 will restart but it will be longer than usual. When it reaches the Home screen, then begin your setup.

Facebook lockup and freezes on Galaxy Note 4

Problem: Facebook continues to lockup/freezes and eventually request to report issue/or close. This has been an issue for months after repeated reports to Facebook and Verizon. Can you help with this issue. Thanks. — George

Troubleshooting: Hey George. Try to uninstall the Facebook app, reinstall it and see if it still freezes. If so, try to see if there’s an available update for your phone and download it. If there’s none or if the update hasn’t fixed the issue, then perform master reset and let Facebook be the first app you install and observe.

After all these and the problem still persists, contact Verizon and request for phone replacement if possible, contact Facebook and report the issue. While waiting for resolution, use a web browser to access Facebook. I know it’s not a solution but there’s not much we can do about it to fix the issue.

Galaxy Note 4 overheats often

Problem: Purchased a Note 4 at ATT a month ago, overheats often. Have a Clean Master app which is nice, wondering if I need a task killer if so what App killer is best performance is OK overall. Temp range in CPU is between 101& 145 degrees. How do I keep phone from overheating? Thanks. — Marvin

Troubleshooting: “Often” is quite a vague word in describing this problem because we really don’t have any idea how often the phone overheats in a day. To make it very simple, master reset the phone (follow the instructions above) and see if the phone overheats without any third-party apps installed. If so, have a technician take a look at it, however, if the device doesn’t overheat after the reset, then you must be very observant of the apps you installed as one or some of them is causing the problem.

The Note 4 is a very powerful phone and regardless how many apps you open for as long as they run normally, they will never cause overheating. But since this issue happened, one or some of them may have gone rogue or kept crashing causing conflicts in the system.

As to your question about the best app killer, there’s none. Note 4 has a built-in app killer, why do you need to install a third-party one to kill third-party apps?

“Unfortunately, Samsung UI stopped working” error

Problem: “Samsung UI has stopped working. Do you want to reset it?” Or something similar shows up 2 to 3 times a day. This started happening after I updated to Android 5.1.1. When I hit ok it refreshes and brings up my lock screen. Bad update maybe?

Troubleshooting: It’s an update-related problem but it doesn’t necessarily mean you got a bad update. Some caches and/or data may have been corrupted especially ones handling the Samsung UI service or Touchwiz. So, master reset will fix it. After all, you just updated the phone, so give it a fresh start.

Galaxy Note 4 fingerprint sensor doesn’t work all the time

Problem: The other issue I have is with the fingerprint reader. I have the same issue as the posted “Why Samsung Galaxy Note 4 fingerprint sensor does not work all the time” question in section 11 or 12. The difference with mine is that either the arrow is solid or does not show up at all. It’s not a fingerprint read error, and the other posted question is having the same issue from the way they described it. The difference with my issue is that I can turn the screen on and off as many times as I want to with no success at fixing the problem. I have to reboot the phone to get it to start working. Again, this issue started after the 5.1.1 update. Any help would be great. Thanks.” — Chad

Troubleshooting: You’re not the only one who reported this issue. Based on testimonies of some owners who were able to fix the problem, wiping the cache partition will do the trick.

  1. Turn off the Galaxy Note 4 completely.
  2. Press and hold the Volume Up and the Home keys together, then press and hold the Power key.
  3. When the Note 4 vibrates, release both the Home and Power keys but continue holding the Volume Up key.
  4. When the Android System Recovery shows on the screen, release the Vol Up key.
  5. Using the Volume Down key, highlight the option ‘wipe cache partition’ and press the Power key to select it.
  6. When the wiping of the cache partition is finished, highlight ‘Reboot system now’ and hit the power key.

Galaxy Note 4 overheats after lollipop

Problem: Ever since upgrading, the phone has started to get very, very hot. So hot, that sometimes it is too hot to have in my pocket or to even touch the screen without feeling burning! I believe the hot area is the processor. At such times especially (but also in general) the phone is very slow to respond to a request such as when I press the key to display any open apps. The most troublesome effect is that whenever anyone tries to ring me, the phone will not respond to my touch to answer in time. Meaning that I almost always have to ring them back rather than simply answer their call – which is obviously ridiculous. I upgraded the SD card to eliminate that possible cause to a Samsung Evo+ so that’s definitely not a factor. Any help would be greatly appreciated! Thank you. — Lee

Troubleshooting: You can blame the old caches and data for that. You can fix this problem by wiping the cache partition and performing master reset after you’ve backed up all your data. That’s all you need to do to prevent your phone from overheating.

Connect with us

We are always open to your problems, questions and suggestions, so feel free to contact us by filling up this form. We support every Android device available and we are serious in what we do. This is a free service we offer and we won’t charge you a penny for it. But please note that we receive hundreds of emails every day and it’s impossible for us to respond to every single one of them. But rest assured we read every message we receive. For those whom we’ve helped, please spread the word by sharing our posts to your friends or by simply liking our Facebook and Google+ page or follow us on Twitter.