What phone do you have?
What plan are you on?
Does your plan include data, or just talk & text?
My 1st gen. Moto X frequently shuts down when I answer a call. I have just cell calling and text and WiFi data and calling. I don’t know the designation of my plan.
It shuts down spontaneously when I tap the Google News app., too. I haven’t figured out what’s making this happen when I try to answer a call; it doesn’t always happen. But sometimes it shuts down spontaneously for apparently no reason. I have, however, dropped the phone a number of times over the last couple of months, damaging the case some, especially in the lower, right-hand corner facing the glass. And the glass screen also has cracked in the upper, left corner, with a crack extending down to nearly the middle of the screen.