[ManInCamo]

I've had this exact same issue as well. Reverting back to OEM SPL and ROM has helped, so it seems, but I'd love to know the root issue.

Once the screen is turned off in any fashion, either from talking on the phone, or pressing the power button, the screen would not turn back on. I could still double-tap the phone button to call the last dialed and it worked. Keys were still backlit as well. Only a soft reset would make the device usable again. This started up on afternoon. Thinking it was a new ROM issue I reverted back to some older ROMs I had used (NRG ROMS) that previously functioned fine. The problem still existed.

I've reverted everything back to stock SPL and ROM in anticipation of taking the phone in for repair -- after that the issue became less frequent.