Since I have upgraded I have had these problems..first when my phone is charging I can't use my phone, it lags bad, the text app freezes, force closes and the cursor always jumps to the beginning n the words mix up. Also while phone is charging the screen always for a to the left from the home screen. I have also had the caller is problem where it takes a min for the caller is to work. I have read through the forums and seen a lot of people say to do a factory reset, before I do that I need to know, will I lose my contacts and how do I back my phone up? I have also seen some people gettin rid of advanced task killer is that app causing problems? I will appreciate any help I can get..thanks.