I just got my phone 5 days ago. After I use it for a while, the upper left hand corner of my screen stops working. For example, I could be using my calendar and want to look at the previous month. It will work well for a bit and then it will not respond. I have tried other apps and I get the same reaction. If I restart my phone, it does the same thing. If I completely shut down, when I turn it back on, everything works perfectly fine for awhile and then stops working in the upper left hand corner.