This thread got me motivated to have another go at getting my height settings right as they tended to be ok for a while and then a short time later were all over the place so I,d bring them back to what they had been. So this time I swapped over all the height sensors from side to side, it took about 20 mins. Then I went through the height settings and instantly i could tell the difference, they were easy to get level, holding their position for 5 days now, fantastic. I would highly recommend swapping over the sensors if you are having "strange" symptoms.