My Singer 778 started making a strange noisse a couple of days ago. DH took apart & cleaned inside. I clean (dust) bobbin area every time I fill a bobbin or change thread,so I knew that was not problem He said I wore it out. After cleaning noise was still there then started skipping stitches. My reverse button is not working, something slipped or broke. If he can not fix it It will have to go to DR. Fortunately I have back up machines. I'm pressed to get a couple of project finished for craft show this weekend and finish Christmas presents.