I got my iphone about a week ago..Christmas time..I've been noticing that the battery goes down half way with about 1.5 hours of internet use..is that normal? Also..my safari crashes atleast 4-5 a day..is this normal? Should I go exchange my phone for a new at the apple store. I kno I sound kind of paranoid but after paying $400 I wanna make sure I have a properly working device. Please help. Thanks.