Your disposal has a clog of some sort. Most likely something such as a plastic bread bag or even a dish cloth is causing your troubles. If there is an unbearable smell then most often its a cloth. Turn off the power and find a volunteer to remove the item
I had the same problem. Turned out that the "weep hole" was a hole in the housing where the water pressure eventually popped a hole through the plastic housing. Replacement was the only option. Ours was a Badger 1.