I have a question for kbent, mcl981 and davoid. Are any of you rooted? If so, have you flashed a different rom?
The reason I ask, I want to get this solved. I chatted with Samsung tech support for about 30 minutes just now. They had me turn off the setting to "Auto turn off screen". I pretty much laughed to myself and explained that that won't fix the problem. They then had me do a soft reset. I did it, but I knew that wouldn't work as I've done it in the past. They then were going to have me clear the cache. (I've cleared the cache and davik cache about 6 times since I got the phone) At that point I said I was rooted and the support stopped. I don't blame them, it's policy. I know from my own experience that the problem occurred before I rooted, so I'm curious of the other 3 people are rooted or not before I call the Samsung tech support number they gave me.
I know many of you think it's user error on our part, but I know it's not. For those of us that have the problem, it's somehow related to the keypad and the proximity sensor. My sensor works as it's suppose to, until I press the Keypad button while on a call.