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Did you get your problem solved ? I had a similar problem with my 2013 VM30i it took awhile to find the problem but we finally got it figured out.

its ran flawlessly for 3 years now.

First I would say, find all 3 limit switches and clean them with brake cleaner.... Then spray with WD40.

Then start machine, run thru calibration mode..... Then do proper shut down and restart and...