@leadstripes
You may have to get drastic and backup the phone to the cloud or a computer and then perform a factory reset.
Once the reset has been done and you have set it up again, leave it that way until you're satisfied either it is still failing or not.
If it is still failing it is a hardware problem.
If it doesn't fail, then restore the phone to what it was before the reset, using the backup you made earlier and check again.
If it is still OK then the reset has fixed the problem.
If it starts to fail again, it is a software problem. You will have to start finding out which app is causing it to happen.
''***Be aware*** that a ***factory reset will erase all your personal data and downloaded apps***. It will reset the phone back to its factory default condition. That's why you ***perform a backup first.***''
Also if there's a Google account associated with the phone, you will need to know the user ID and password for the account as this is required to be entered into the phone when setting it up again after a factory reset. This is due to the FRP lock (factory reset protection) that has been enabled by the reset.