Who I have the same questioned this topic

Over the past few days my G3 has begun constantly rebooting by itself. It has occurred over a dozen times for the past 2 hours whether I touch it or not. Every time it reboots itself the message comes up saying the process system is not responding. I did a factory reset on it a couple days ago when the problem first arose but it continued and only worsened at this point. I've spoken with others and the only answer I've gotten is to factory reset and that the new update is basically crap for the G3...I'm currently running on Android 5.1.1. I have no idea how to aleviate this issue and my phone is essetially useless at this point. I still have a year on my contact before I can upgrade away from this device but I don't see it making it another month or week at this rate.