I just got my A7 a week ago and have noticed that if I spend over 15 minutes on a call (all calls originate or received from my home office) the call gets chopping and ultimately drops. I'm with AT&T and they show I have good service in my area. I never had problems like this with my HTC M9.
I'm within a 30 day window to return the phone to the seller. I've found several posts about similar issues, but no answer from ZTE. Should I return my phone?