I recently had a really bad stuck mash on a pumpkin beer, 10 pounds of pumpkin meat jammed up my MLT something fierce. Eventually I figured out that the soft vinyl hose between the false bottom and outlet collapsed due to the heat, weight of grain, and the vacuum induced by the hose end being below the surface level of the wort. That was the same piece of nasty hose that had been in there since 2006 (6 years) so decided to re-do the whole thing.
Using stainless compression fittings I ran a short length of copper tube between the false bottom and outlet. Keeping the compression fittings finger-tight lets me remove the false bottom for cleaning.