Dishwasher overflow
Doing dishes today and water was coming out the overflow pipe next to the sink
Wife called a plumber she knows... he asked when was the last time we put a cup of white vinegar in the washer... in a bowl so the vinegar would "time release" as the cycle ran... to dissolve the "gunk" that builds up inside the drain tube
Seems that a "thin" film of food waste will build up inside the drain tube, even with rinsing dishes, so now once a month I will put a bowl on the top rack (no place on the bottom rack due to the dividers for plates) with vinegar so the vinegar will release as the water bounces off the top and into the bowl
This is of course, after removing everything under the sink so I could put a shop towel down to partially crawl underneath to remove the rubber drain tube to use a screwdriver and my finger to reach in and remove the built up layer of residue

