Same as @kmanstudios, I never had that problem since I got my UM3E. I do manual leveling from time to time, and let the active leveling work it's magic with each print.
Did you check to make sure there isn't something in the big screw that could hinder the vertical movement of the plate? Did you also check if your plate is flat enough? It seems that quite a lot of glass plate are bent in a U shape, more or less heavily. I had to get a replacement for my first plate because it was way too bent.
The main problem I had at the start when leveling was due to a misunderstanding of the instructions: when it went to calibrating the z-offset for the second core, I would turn the screw instead of turning the front wheel. Baffled for a time before I understood my mistake (not native-english speaker). That might also explain your leveling problem.
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kmanstudios 1,120
I do not experience this. I do set a manual every now and then to account for any drift in the leveling as it goes up and down and through heating/cooling cycles as well as plates being bumped around for whatever reason.
But, when active leveling, I do not have issues with it at all. All of my failed prints can be traced to mostly user error.
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