Hi @michaely.9uuizv - you might also try restarting the phone in safe mode to see if a 3rd party app is causing a problem. An update to an app could start causing a problem.
Here’s an article with a list of 3rd party apps and problems they can cause. Not sure any of them are directly related to your problem but it’s worth a quick read. What 3rd Party Apps Are Problematic with Republic Wireless? – Republic Help
A person in another forum reported that their E4+ stared acting wonky. For some reason the proximity sensor only seemed to work when the screen was on.
They discovered that if they went into the Moto app (that comes with the phone), and choose the “Moto Display” option, and turn OFF the Moto Display switch (sublabeled “Friendly notifications fade in and out while the screen is off”), the proximity switch starting working fine when the screen is off!
Just a few other things to look at and try! Certainly understand how frustrating the problem you’re experiencing can be.