When I raise and lower the presser foot on my Jamome 6600, it makes a clunking noise just before it reaches the feed dogs. It sounds like something is catching in the lever. I've cleaned everything, checked to make sure all screws are tight, and tried different feet. Nothing helps. This started happening after I had been using the dual feed system ( built in walking foot) for doing the bindings on several hot pot holders. Any ideas how I can rectify this? I don't want to continue sewing if something isn't aligned....this machine is only 2 months old. Any suggestions would be greatly appreciated.