Has anyone experienced this?

Problem: While on a call, the phone goes normal. No, the screen doesn't just dim; it goes off. Pressing keys or numbers do not wake the device back up. It is as if the device is sleep. The hard buttons work, so pressing the red button will hang up or pressing the Phone button will wake it up so you can press the keyboard keys again.

This was discovered while the user was trying to listen to Sprint Voice mail messages. All keys (press 7 to delete, # to skip, etc) presses are ignored.

Additionally trying to go to the phone preference (menu-p), while on or off a call causes the phone to reset.

Anyone have a clue?