Bradley smoker that shuts off for no reason

Question

My dad bought a Bradley smoker this week and we are trying to use it for the first time today. It has shut itself off a few times for no apparent reason. It always comes back on, but we can't leave it alone for two hours like we would like to. Any ideas? Have you heard of any electronics related problems with these? If I had to guess, I would think some sort of limit is being tripped in it, but I obviously don't know. Any help is appreciated.
Nick