So after talking to her more about it yesterday, and having her remove the screen protector that was covering a sensor, I found out that she didn't have any issues with the screen not coming back on until the recent OTA patch was pushed. A few minutes later, she got another black screen! I've read on other forums that Pandora could be a culprit, so I had her remove the app last night. If it happens again today, she's going to try and reseat her SIM card when she takes the battery out. Is anyone else still experiencing the problem?