The motor is overheating and control features cause it to shut off to prevent burning it out. First check the bag. If it is full, remove and replace with a new one. A full bag can cause the motor to work harder, and thereby overheat. Next check the filters. A dusty filter will keep air from cooling the motor and again cause overheating. The HEPA filter needs to be checked also. Most filters can be dusted off. Some can be washed, air-dried, and replaced.Others will need to be removed and replaced. Your owner's manual should tell you how to clean filters. I hope this helps. If it solves your problem, please let Fixya know and post a rating for my solution.
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