My 244 Portastudio was recently serviced and has successfully played through a dozen or so cassettes. [I'm archiving my library of 40-year-old recording sessions to digital files.] Unfortunately, it's now pooping out - on playback, it'll just quit. I can sometimes FF and Rew. Other times, those functions give up too. It looks like its trying, because things move a little, but strain and eventually fail. The cassettes are fine. I can turn 'em easily with a pencil. I'm wondering if it's heat related because it's quite hot here - especially in the studio - and, if I turn the 244 off for a while, it returns to normal, playing cassettes it gave up on before. Do the belts get 'slippy' at a certain temperature? Does the motor give up temporarily when it overheats? Should I wait until evening, when things cool off? Any advice is appreciated.