I recently started to have this issue on my form 3.
I have to take out the resin tank and use WD-40 to try to lubricate the axis in order to get the machine to be able to print. Otherwise, I can see the laser unit doesn’t move and feels it is stuck by something.
I also notice the resin tank bottom film starts to get fell down in the center. I guess that maybe cause the problem since the prints during curing may jam the laser unit from moving across.
Not sure anyone here has the same issue.