Here lately my Janome 6600 will go a bit nuts while I am sewing. I have steady pressure on the foot control and it will sew fine then it will bog down and go slow then it will ZOOM and race for a few stitches. Last night I took my foot off the peddle all together and it kept sewing for stitch after stitch. So I put up the presser foot and it complained beeping for me to put it down so it could keep sewing. It is like it is getting the signal to sew but no one is sending the signal. Have any of you had a problem like this??