it was working fine for almost 2 weeks, this morning when i woke up, the battery went down to 90% even though i left it at full last night, which is weird because its usually 100% still by the next morning. Then i started using it for small apps like browsing facebook and reddit (no videos or anything), and it drained another 10% within half an hour. The phone was also heating up quite a bit. Restarted it, charged it back to full, and it did the same thing. What do i do? I want to exchange it in apple store, but none of them have it in stock.