Do you have a sew machine dealer close by? Mine was doing that too, and I had to press on the foot pedal a couple of times to get it to sew; or it would keep sewing after I took my foot off . I had taken my pedal to the dealer about a year ago and he took it apart and cleaned it. but it has been doing it again ; so I took it back and he sold me a new one. He said they sometimes wear out after a lot of use; the soldering breaks.