I have not had the blade height wander but I am having a related issue. The blade height on my DWE7491 is stuck at the maximum height. This is a saw that only has about 60 minutes of use so corrosion should not be the problem. Nevertheless, I sprayed WD40 on the two shafts and was able to get a little movement up and down. I don't want to put too much leverage and was hoping someone has had a similar issue. This happened after I was ripping some rock maple which is surprisingly dense. The saw did not overheat or bind.
