I think my battery was swollen and causing the separation but I didn't know for sure and while waiting for replacement I heard a pop and screen cracked, it already was lifting away from sides too and I could tell something was causing it from inside the phone and I told this to the T-Mobile Rep when I went to show them because I only had the phone 3-5 days and it was progressively getting worse. But while waiting for replacement, that sams night it finally popped and cracked and now they won't cover it, saying my phone is out of warranty and charged me the balance while they have the broken phone and I now learn I can get it fixed elsewhere.