Sounds like your motor is overheating and tripping it's internal thermal protect. You then have to wait for the motor to cool down so the protect will reset.

Try turning the drum by hand to check if it is overloading the motor.
It should turn fairly easily.

Open the unit up and clean the motor, it could be that it is clogged solid with lint. I would also clean and check the blower wheel. If there is a lot of lint inside the unit check the drum seals etc.

If the above are OK odds are high that the motor is toast.