Screen becomes non-responsive during calls

Hello:
I am having an occasional, but seemingly becoming more frequent, problem in which the screen becomes non-functional during calls. My immediate impression is of removing the phone from my ear to end a call and the screen not lighting up. Eventually, after I played with the buttons (which may or may not have really helped) the phone lit up. This has also happened when the phone was ringing, making it impossible to take the call.
I am using the most current firmware, but believe the problem began with an earlier version. It just seems more frequent. I cannot reproduce the problem on demand.
Ideas? Solutions?
David

The proximity sensor, which is what tells the phone to turn off the touch screen when the phone is against your face to prevent "cheek dialing", is located just above the ear speaker hole. Do you have a case or anything else on the phone that could possibly be blocking the sensor?
-SB

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Screen becomes non-responsive during calls

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