Try starting the phone in safe mode and check if the problem is still there or not.
If it works OK in safe mode then a downloaded app is the cause of the problem. The trick is to find out which one.
You will have to uninstall each downloaded app, one by one and test the phone in “normal mode” between each uninstall to see if it works OK or not. When it does work OK then the last downloaded app that was uninstalled is the culprit.
Try to recall when the problem first started and check what downloaded apps were installed around that time (if any) or what downloaded apps were updated about that time and start with them first.
If it still doesn’t work in safe mode try wiping the cache partition (should be the same for your model) and see if that resolves the problem.
If that doesn’t work try a factory reset to determine if it is a software or a hardware problem.
Be aware that a factory reset will erase all your data and downloaded apps. It will restore the phone to its’ factory default condition (or last system updated condition) so it is important to backup the phone first before performing a factory reset.
After you have backed up the phone to either the cloud or a computer, factory reset the phone using either method as shown in the link.
Once the phone has been reset, check it it operates correctly.
If it doesn’t then you have a hardware problem.
If it works OK, restore the phone with the backup that you made earlier, using the phone’s restore feature.
Once it has been restored to what it was, test if it still works OK. If it does then the reset has resolved the problem.
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