I think I found out the error
I'm more convinced that it is my sweater that comes on the jog wheel and trigger the problem. For I have set the jog wheels to be as loose as possible because I have the opportunity to take back spin etc, so it is a small gesture from the sweater enough to trigger the problem. I adjusted the jog wheels to be a little firmer and could not then trigger the same problem anymore
So looks like everything was just a problem that I personally made, but really good to find out.
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