So my UpBox+ Exturder stepper motor began to behave exactly as in this video. Fans and heater work fine though.
It started happening after I serviced the printer belts and rails and cleaned out all the bearings. After thinking what could I have disturbed i noticed that the 1st wire (highest when installed) on the FFC cable was broken… not sure how but it was… soldered it back together with low temp solder and that seemed to fix the problem… but now the stepper has failed completley and doesnt turn and when the printer is on there is no resistance to turning the stepper gear by hand… it behaves the same as if the printer is off. Any ideas?