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If you're on a call, the screen will turn off after 10 seconds or so. It's an odd quirk I found a few times while on calls. I don't believe it's an issue if you're using the phone and actively using the data connection, like a web browser, but I've never checked.
I didn't have my phone is speaker, and that is where my issue was probably coming from. When using the phone against your eat as normal use, the screen goes black when the device is in a vertical position. When. U tilt the phone to use the dual pad the screen will turn back on. When I hit home to exit the dialer/ in call screen while on a call my screen keeps strobing on and off making it very unusable in a multitasking situation. Like I said I wasn't using speakers phone so that may make the difference.

Yea I knew it did.
I wonder how many phones are able to do this. I guess we've concluded the gnex doesnt. I know my droid charge doesnt. Does the razr keep 3g while in call? How about the s3?
I was having this issue as well, and a few days ago I found a solution...at least for me. Try wiping the area of the screen around the motion sensor as this has resolved my issues.