During a call, I will hold the phone away from my face to see how many minutes I've been talking. Normally, it will correctly show me the call screen, however, sometimes it will flash the home screen briefly before going back to the call screen. There seems to be no rhyme or reason about when this happens. Even worse, sometimes it flashes the home screen briefly and will go to a blank screen. I will then need to press the home key in order for it to return to the call screen. This happens sometimes, as well, when I finish the call. Previously, I had the Not Call Log application installed but I've removed it. Also, I previously had my screen timeout set to one minute but changed that to thirty minutes. But, this behavior still happens. Any ideas, suggestions?