Hi, I had some trouble w/ the gantry stuttering then stopping.
Assuming you’ve tried the steps on this page:
The one other thing I found was lower accelerations and lower stepper driver output helped avoid the problem. I ended up w/ acceleration of 450 steps to max rather than the default of 300, and I also turned the voltage down to ~700mv on the x and y axis. (And needed increased power on z or else it wouldn’t move up.). This was after turning the power up and making the problem worse.
Not sure if this will help, since from the video it looks like one side is getting ahead of the other. (Maybe verify the power on both stepper motors is the same?)