I had the same problem with my Janome foot pedal. My machine would just start sewing when I wasn't even around it! Yikes! I had to unplug my machine every time I was finished sewing for the day so it wouldn't start up on it's own in the middle of the night. Had the pedal replaced & that fixed the problem. Now (years later) I have another foot pedal problem. A lot of the time my machine won't start sewing when I push down on the pedal. If I "tap" it several times & sort of move it around on the floor it will start again. I have a start/stop button on my machine & I've resorted to using that now until I can get another pedal.