Gantry sliding seems loose?

On the right side of my xcarve it seems way too loose! Barely touch it and it slides. It is throwing my carve off. Is there a problem with the belt? Or maybe v wheel? VID_20210415_131322808.mp4 on Vimeo

Was the machine powered up when that video was shot?
If so and your others do not move easily you may have a broken wire.

Moves the same way by hand on or off. The slightest bump or maybe if a hard knot can or would throw it off.

Did you figure it out? Mine started doing the same thing tonight.