I think the motor is heating up and kicking out on thermal overload. Is this dryer running in a hot room with poor air circulation? This can make a good motor overheat and trip the internal thermal protection.
Also check the drum rollers and drum rolling resistance.
If the room conditions and the rolling components are okay, then the motor is on its way out anyway and you'll be replacing it sooner or later:
The dryer has ran in that same spot in the garage for over 20 years with no problem....BUT, this is Texas and it is getting hot! After reading this post, Early this morning I set a fan in the dryer housing aimed straight at the motor and it ran a 60 minute cycle without stopping. I tried it again this afternoon in the hot part of the day and it stopped every 10 minutes.
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