I've tried everything I can think of to resolve this, but I need some suggestions. So - my husband finally got a smartphone, after getting by with a keyboard phone for years. I talked to him about different phones - iPhones even - and after looking at several, he took my advice and got a Droid Maxx. Of course I helped him set it up, etc. Everything went well for a day or two, but then he started getting all sorts of errors - Google sync problems, Google account sign-in problems, "Unfortunately Google play services has stopped" etc. I was able to solve most of the problems by uninstalling updates to Google Play, and a few other things. He was still having some issues, though. The phone occasionally shut itself off. So, I decided to do a factory reset. Since then, everything is working much better. The phone hasn't shut down at all, etc. However, in the last day or two, he will get an error notification that's something like "Trouble signing in to Google Account". He has to tap the notification and enter his Google password. Then everything seems fine until it happens again sometime later. He has almost no apps installed. The two or three he has installed are the same ones that I have used forever on my android devices, including on my Droid Maxx and Moto X - so on the same or similar devices. I have checked every setting I can think of. He doesn't have 2-step authorization on his Google account and he never has problems with that account on his desktop, laptop, etc. Any ideas what could be happening? He does drive through an area with no cell service every day, so that could have something to do with it, but I drive through the same no-service area, and I have never, ever had to sign in to my Google account after initial setup.