I don't know if this is a known or reported issue, but there appears to be a severe flaw with the stopwatch application in WM6. For work I've been timing the duration of application runs which can be over 2 hours long. Any time I let the stopwatch go over around 1:40, I end up having to power on/off my phone before it will function properly again.
Not the most critical issue in the world, but I thought I'd put it out there to report it.
I wonder if that is a device specific application. I have a Q9m and it is not there which would lead me to believe that Samsung added it (or Motorola removed it). I would guess it is an added program and not part of WM6