I have never had a problem with the deflector. I assume you have unclogged the disposal using the disposal wrench and pressed the reset button. I would try filling the sink with hot water and running the disposal. Also, never run the disposal without running the water at the same time. Another thing to check would be the "automatic vent" if you have one. It is a pipe that connects above the trap and terminates just below the underside of the countertop. You can remove it and make sure that it is providing proper venting.
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