While making a phone call the screen times out and goes blank, this should be normal to enhance battery life. However, I have had a problem with the screen coming back up when I would like to hang up or dial on the number pad. It seems to work intermittently. Funny story: I was calling a friend and got his voicemail when this issue happened so I could not hang up to stop recording. So my friend got about 30 seconds of me cussing at my phone trying to get it to respond. Needless to say hilarity ensued. Anyone else having this issue?