I don't think that it is the status bar clock or it's alarms. I've had the status bar clock installed for a wile without any problem. I also was having problems with out using the alarm.

It could be the personal menu or a combination of programs. I don't think I had problems until after updating personal menu, but I will not bet on it.

I re flashed my n800 last night and I am slowly reinstalling apps/programs one at a time to see what might be causing this problem.