It's overheating. Empty the cup and replace the filters. There's a breaker that opens up and turns it off when it gets too hot. When it cools down it closes back up and it will run again. It'll argue with you til the end of time or until you fix the problem.

Good Luck

I have this exact problem and have taken it completely apart multiple times and cleaned it completely. It is the automatic reset switch and if this starts happening to your vacuum it won't stop. Time to trade it out. Mine was only 6 months old and I could only vacuum for 5 min at a time. These were just a bad series of dirt devel vacuums and it's unfortunate because it works extremely well when it does work. It's just a factory mess up with the motor overheating. :( loved my dirt devel. They need to recall them and give us new ones!! #dirtdevil