Kohler / Commode does not empty at times when you flush!
Purchased a Kohler toilet and sink last year. The toilet is K-4609-AA, 1.6 GPL. From the beginning every approximately two weeks to a month, when we flushed, the commode would not empty. We have had plumbers out a number of times and they replaced all the flushing mechanisms and rotor routed everything. When the commode backs up, everything else drains. The last two plumbers told me the problem was in the unit itself. The last one had 25 years experience and stated that he has seen this type problem with some kohler toilets before.