This Kenmore dishwasher is about three years old and has been far more problematic than the last Kenmore dishwasher I owned, both made by Fridgidaire.

Anyway, already replaced were the sump, diverter motor, and circulation pump. Now, the dishwasher doesn't drain fully at the end of a wash cycle. This had been happening infrequently (one in every 20 washes) but seems to have increased in frequency. If I start a rinse cycle, the first thing the dishwasher does is drain all the remaining water, leading me to believe that there is not a blockage and, possibly, not an issue with the drain pump. Running just a rinse seems to complete just fine, draining all the water.

Any suggestions would be greatly appreciated.