Z Axis not moving properly up

[Cjaramillogrows]

Z axis dropping during sequence

Hey guys, i was executing my plant basil sequence early and about 80% of the way through my sequence my Z axis drops about 100-150mm out of nowhere and messes up the positioning/sequence (it will try and pick up a seed from the bin but because of the drop the tool head will smash into the bin) Anyone else had this problem before? it makes a pretty intense sound when it drops hope you all had a good weekend! -CMJ

adding a link to this post for a topic just created along the same lines of this issue