Originally Posted by or8ital

Yeah, our guess is the cooling of the motor (these things can put a frost on your motor) then the rapid warming of them from running them seemed to cause something to go wrong in the motor and they would fry on us.

Some people have said they have used them indoors without problems so I thought was that it must have something to do with the difference in temperatures. All I know is once everyone stopped using them then we didn't have anymore motors go bad.