The symptom is dirty rinse water left in the dips in the bottoms of mugs etc. when the wash has finished, and also slightly 'not quite clear' glasses. The basic removal of dirt seems to be working OK still, it's just that the rinse isn't clean.
The only other thing I've noticed is that it seems to 'retry' starting up the main pump/wash motor sometimes. For example I ran a 'rinse only' cycle recently to see how it went and the pump seemed to try starting several times (with a momentary sound of splashing water etc.) before it actually started running continuously.
Does anyone have any ideas what the problem might be?
I've checked for blockages as far as I can and have cleaned all the filters very thoroughly.