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The repairman told me this is as commona problem as you can get. Dirty stuff is washed off the dishes and is ejected into the darin. There are screens and on some (like mine) a mini disposer to break apart larger items before it goes into the drain. But if anywhere along the line from the tub to the drain, stuff has accumulated, it can back into the tub causing what seems to be the problem.
There is a DW cleaner that you run in the longest and hottest mode that suppose to break this stuff up in the tub, strainer, drain lines AND recirculating lines so it can be flushed away.
Ah ok, I will have to see if I can find that cleaner. Thanks so much I'm pretty sure we dont have a mini disposal on ours since we have a septic system, but i could be totally wrong!