Motor works when canister lid is open, but stops when closed

My Dyson started pulsing on and off while vacuuming. I cleaned the filter and removed all dust/debris from the bin/canister. The odd thing is, the motor works fine when I have the canister attached, and the canister lid is at least partially open. As soon as I snap closed the canister lid, motor starts pulsing on and off rapidly, and vacuum will not work. I don’t see any clogs anywhere, and since it works fine with canister open, I know the motor and battery are OK. Any suggestions would be greatly appreciated!