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you might try checking your needle to see if it's bent-roll on flat surface to see if it roll correctly
or blunt or damaged
some sewing machines bunch up like that when the thread come off the thread take up lever
also check the top tension
check for lint or loose thread in the bobbin area
check to make sure the bobbin is wound correctly
Try moving the stitch length dial to 4 or 5 - check the manual. You may have it in the position for very close together sewing. I had to do a lot of trying with my 4795 to get it to work right. I found that very thin thread, polyester kind, broke at the needle after a couple of stitches. I switched to coats & clarks thread and a Singer ball point needle and it works fine. Be sure your needle is inserted with the flat top toward the back of the machine. Good luck!