The extruder starts moving in small area and very small distances - almost over same place. Normally it should move from cornert to other end of the piece(printed box here). Its like paralyzes over that small area.
Sometimes it survived it and start printing again.... mostly not
Usually move to wrong place and starts printing on air.
With many workpieces, it melts them from the same points.
Sometimes - not always - it seems that the worktable has lowered too much..Edited by WisePrinter
When it moves very slowly - does the extruder move a long distance? If so then I am familiar with it. Change the other board. The one that the SD card goes into. Or at least try cleaning the connectors where the SD card connects inside. Also maybe move the two ribbon cables to a slightly new position.
I had a single tiny hair - maybe an eyelash in the connectors. After cleaning that the problem still happened but much more rarely.
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