IPhone Screen Goes Blank

While making a phone call, when I take the phone away from my ear, the screen goes blank and I cannot end call or see call waiting - finally the screen comes back to slide to unlock, and the phone call is ended.
Anyone else having this issue? Any fixes?

WOW! So that's what the issue is!
Petshows, since getting my 3G last Friday I've been plagued by the same problem. It's been so chronic I suspected a fault in the iPhone itself. My first gen unit never exhibited this behavior so I was on my way to the Apple Store tomorrow to report it to the techs at the Genius Bar. But...
...I'm now convinced that Nathan C. has identified the source of the problem. I use a DLO brand "Jam Jacket" I bought for my original iPhone. It has little cut outs at the top for the position of the proximity sensor and the earpiece. I now suspect that either the 3G proximity sensor is less sensitive or its position is slightly different from the first model and it isn't aligning properly any more.
To test out Nathan C.'s hypothesis, I made a call long enough for the 3G screen to go dark. Lifting it away from my ear, I verified that it was not waking up as it should. I then flexed the upper part of the Jam Jacket's case to reposition the proximity sensor cut out and VOILA! the iPhone screen wakes and I can press the Hang Up button as usual. Now my only issue is whether to modify the cut outs and continue using this case or buy one that avoids the source of the problem.

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