Why does my FaceTime hang up overnight?
The answer is in your question, FaceTime has to do with a face-to-face call and whenever you lock your phone. It’s telling the system to shut off temporarily ‘causing it to think that you’re not going to be in the call (FaceTime).
Why does my FaceTime keep dropping out?
A: It’s not unusual to have a dropped FaceTime call, and there are several possible causes. The first thing to check is whether you and the person you are calling both have strong Wi-Fi signals (the weaker the signal, the less data-carrying capacity.) Then scroll down and make sure “Wi-Fi Assist” is on.