Dear Sir:Please LUBE the machine, you have a lack of maintenance, in according with the instruction manual, Produce enough friction between deck vs deck belt, may the deck belt is worn. By that reason Shut down for to protect the electronic system.2) Test the input voltage for main motor if there voltage, the motor need repair.3) Test the main motor board for output voltage for input in the main motor , if there are NOT the board is faulty.4) Check the rollers bearing LUBE.sincerely. God bless you