It's Happend Due To OverHeat Of Device And Poor Glue.In Some Device The Back Panel Also peel Out Which also Happend With Me. Now The Sollution Is To Paste With Any Type of Glue or Better To Take It To Local Store They Will Paste it Better With Gel Glue.
Yes, it happened with my phone also, then i sticked up from the service centre, which cost me about 350 to 450 indian rupees but still not satisfied, they came up like it was before.
