Hi. I recently bought an Iphone 4s off ebay and was having battery problems from the start. The battery could die between 1 and 50% and there was a serious drain. I recently got a new battery and this sorted that problem. Now all of a sudden my phone (particularly the back towards the right) gets really hot if I simply just scroll down twitter or facebook and I get a temperature warning. I literally have to leave my phone for about half an hour and can only go on it doing small things etc. What kind of phone does this? DOES ANYONE HAVE A FIX PLEASE!?