It does sound more like a machine problem, bobbin, thread and needle being the first 3 things to change out.
When that happens on my machine I usually need to change the needle.
It is gremlins indeed. Have had similar happen. I would delete it from your machine and reload it from your software. Good luck. Nan W
I've had this happen to me also then stitched again on the same fabric and it would stitch perfect. Maybe it's embroidery gremlins?! ;-)
Did it twice on same type of fabric (polar fleece) - both same problem. Only thing that is different is the way I transfered the design. I use a card but because it is a repeat I've saved it onto the machine. Perhaps I should have rather stuck to the card. On the other machine I've used a usb stick and previously I've used the card. Maybe it is a memory problem?
card. On the other machine I use a usb stick. Previously I have done the stitching from the card. Perhaps it is a memory thing?
This has happened to me,a very simple in the hoop design could not understand what happened,had enlarged it on machine, thought that was it,have since redone it perfect,and it has never happened since
Have to add I have adjusted the tensions etc. Only thing I Have however not done is to reload - as it is a big design and I can not now do a re-test. I have done another design also as a test stitch and it seems to be fine. So I seems not to be a general tension problem.