if filters are OK a blocked pickup pipe WILL cause the motor to trip the THERMAL OVERLOAD . I think some thing was run over with the vacuum (accidentally) this went around the brush this snapped the belt the suction of the motor sucked the object up the pickup pipe but it has not got into the cyclone chamber therefore still in the black pick up pipe need to remove pipe and clear internally
a couple of drain rods are the ideal length
wirecutterman, January 2009