Chosen Solution

The proximity sensor doesn’t always work. Random buttons are pushed while talking, goes on mute by it’s self. Shuts down and restarts on it’s own. Now has battery issues. (Has a mophie - only way to keep a charge - most of the time)What’s going on with my iPhone 6???

Gremlins for sure :>) Now seriously, you have a lot of problems. What happened to your phone in the last little while; was it dropped, damaged, came into contact with water or previously repaired? They may all be related (logic board issue) or coincidental but this phone needs to be looked at. You can try to open it up yourself to see if there are any gremlins, er…something weird inside. With so many problems, it’s going to be expensive to troubleshoot yourself though so you may want to consider having it looked at by a reputable shop.