Well, I found out what was wrong for me. I was a relatively early backer, and got in on the first non-beta shipments. The bed that shipped with mine had rubber “O” rings underneath, around the thumb-screw holes. It looks like they bailed on this design, using metal nuts instead. Probably for this very reason.
One of my O-rings became dislodged, and would not settle neatly back into the channel that they have to help hold the O-ring in place, since it isn’t properly aligned
(and there really isn’t a good way to cram it back in and have it stay there without some sort of glue), the bed was raised on that corner. That corner happened to be the top (front) left corner. Since it was higher, the nozzle banged into it every time it started. After installing the new model (with the hex nuts instead of o-rings), it is working normally again.
Getting a new bed might be the solution that is needed here…