I shows up more when it gets hot (games or charging). Any tips on getting it replaced at the store? I figure I'll wait and see if it gets worse, and get the most out of my waranty. BTW...I replaced my original when it was supre buggy and crashed all the time. That was in July. The serial lookup tells me this one is covered until About August. Does my warantee expire 1 year from purchase or 1 year from when I got the new iphone?