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issue #1 is the real problem. Something is either binding or has too much friction.

issues #2 and #3 are caused by whatever is causing problem #1 sorting itself out in the middle of a filament ejection. #3 is indicative of too much weight.

I'll let you know what I find in my testing....

In the interim, it would be great to diagnose your failing rewinder to some degree. have you tried swapping any of the parts?

For instance, swap the track and weight between the stands and see if the problem stays with the black spool or moves to the yellow.

You could also leave the tracks as they are and swap the spools and hubs (assembled cap, shaft, and nut) between stands and see what happens. Does the problem stay with the stand (potentially indicting the stand, gears, or track), or does it move with the spool?