Nah, Windows isn't stable enough to run for that long without crashing! ;)
I've seen the same thing time and time again. The only resolve I've found is to either re-start all the backup exec services (for ease, start with the Notification Server service, as that will stop about four of the other services at the same time), which will kill the job, or to reboot the server entirely. Obviously the latter is less desirable in most circumstances.