I have this exact same problem. It was doing this yesterday, then eventually it started working again. And now it is doing it again this evening.
The really perplexing part is that I'm not sure if it's a hardware problem.
If I run the Interactive Test that checks the proximity sensor, it works. If you haven't already tried, I'd be interested to know whether your phone behaves the same.
In case you haven't found the tests before, you can find them here:
Device Info App
Scroll to bottom and hit More Info
Tap Preferences menu at top left
Choose Interactive Tests
Screen Test
The second test is the proximity sensor test
The fact that the sensor works in the test mode makes me wonder:
a) Is there something flakey in the phone app software?
b) Do they have the sensitivity in the test mode really bumped up?
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