Got this iPhone 4 as a replacement a week ago and it's been acting strange. It keeps restarting itself, rearranging my apps, and turning itself off. All the other times it turns itself off it would turn back on just fine. However, this morning I woke up and it was off...but it won't turn back on. I'm planning on returning it to Apple sometime next week, but I still need my phone to work until then. Can anyone help? iTunes doesn't even recognise it.