This weekend I needed to remove the laser head for cleaning. Ater I did this, I left the head positioned in an unusual spot: towards the right side, near but not at the back. When I powered the unit back on, it started doing what can best be described as a random walk (the engineers will know what I mean). I let it continue for some minutes until it was clear that it wasn’t going to converge to a solution on its own, and then I powered the unit off, repositioned the head under the lid camera and powered it back on.
Just reporting this since it seems like a new bug; it’s not blocking me as I was able to work around it.