Hello, so I'm not sure if anyone else has reported this problem yet, but my 9930 for the past couple of days whenever I've been on a call, my phone's screen would not respond to any touch or keypad movement for the screen to turn on.
The only way it would turn back on is if I pressed the END call button. However, I would see a menu open and be on a different screen which tells me my phone is technically responding to my keys, just not lighting up the screen when doing so.
I've pulled the battery already a couple of times and on the stock OS that my Sprint 9930 came with.