This has just happened to me, so I am posting the question on here until I can call my dealer.
Has anyone had a knocking noise while sewing with a Diamond Sewing machine? It just started doing this while sewing a straight stitch (not going over any seams), I tried cleaning the bobbin area and turning the machine off and then back on and it still does it.
I am not going to sew on it anymore unitl I get it checked out. Hoping to get an idea what it could be, until I can call my dealer. Sad Face