Gen 1 BB Controller Z-slider moving in random directions & losing homing/positioning

[OnefinityCNC (Onefinity CNC Official ✅)]

On a BB controller, this is 100% of the time a bad wire/wire connection.

3a and 3b on this faq will identify which wire(s) and get you fixed up:

Troubleshooting: Rail is getting hung, stuck, grinding, or moving in opposite direction

Rail is getting hung/stuck/grinding. Special notes to read before following each step: A rail getting stuck/hung is typically one of two things, either a wire/connection issue or the grub screw on the ball screw isn’t tight on the side that isn’t moving. One thing to remember, stall homing adjustments do NOT affect rail movement during cutting or jogging. If the rail isn’t moving correctly during cutting or jogging, incorrect stall homing is an affect of this greater issue. Any time the axis …