Sorry didn't see your thread until today. Yes I had that happen 1 month after I got a brand new phone. The phone won't ring even the volume is up full (wife called and I didn't know....not good.). So I called Verizon for a replacement, then send me a refur that has a green tint on the upper left corner on the screen. The original phone start working again as the replacement arrived, waited a 2 days and it died again, so I keep the phone with green tint. Call Verizon and bitch again, they overnight another replacement. This one looks like it's a older HW revision as the label on the back looks different.
All this happened about 1 - 1.5 week after ME7 release, so both replacement were MDK.
If I were you I would call them back and bitch ME7 is buggy and see if they will do anything for you.