Bosch Classixx WTE102GB keeps cutting out?

Hi my condenser dryer keeps cutting out, the hotter it gets, the shorter time it stays on for. We asked a specialist that said it was the temperature limiter at the back, which we have replaced. We have also replaced temperature limiter (with the red button) as a precaution and also the one at the front in the filter cavity. The pump has been dismantled and cleaned. The whole thing has been defuzzed within an inch of its life. All seems to function correctly but something seems to be cutting it out, then it won't start up again until cool. The only other suggestion is the control module is faulty, do you have any other suggestions, before I give up the ghost?