Could be your belt tension.
I just did that and also was suggested to remove the assist and clean.
This piece fell off and is broke.
Also when the laser head goes back and fourth. You can see it skipping.
I’m going to cry.
Well, now we know what the problem was. Support will get you fixed up!
I see you already emailed us about this and we’re working on it there, so I’m going to close this topic.