What Tom said...
What Wheelz said...
While it is a wonderfully made machine, sometimes it never hurts to confirm at what level it's working.
Definitely check the inside temp of the smoker. FYI, while a lot of people have their butts take 2 hours a pd, but mine seem to take never over 1.5 in my smokette. 2 hours seems to be more of an average lately in the forum, so more than 2hours per is probably an indication of lower internal temps.
Smokin'