Plumbing problem??

Does anyone have thoughts on fisher & paykel dish drawers? I have had one since 2005. I works only 50% of the time! It "overflows" and sets off the trip switch and needs to dry out 24-48 hours with a good fan and then as good as new! Repair tech can't Dx the problem when wet (broken) and when dry it works. So neighbors thought it could be a water pressure ( too high) problem! Thoughts?? Thanks

It sounds like a drainage problem (blockage), They discharge very quickly and if there is a restriction in the drain it could back up and trip the sensor.