My phone does this too. I use it as an alarm clock at night, and it brings up the alarm clock automatically when I put it into the dock at night to charge. The status bar crashes almost every morning when I take it out of the dock. It also will occasionally do this during the day when it's not docked or connected to power. I haven't figured out a pattern of when it happens during the day. My phone is:
Hardware version: i510.06
Gummy Charged GBE 2.1
firmware version 2.3.4
Baseband version i510.06 V EE4 SCH-I510.EE1
Kernel Version 2.6.35.7-EP1
Build number SCH-I510.EP1
I'd also be interested to know if anyone knows why this crash happens, or can tell me how to help debug to provide more information next time my status bar crashes.