OK here is the back story. Last year for Christmas DH got me a Voyager 17 mid arm and frame. The machine had a crack in the finish, so they took it back and replaced it. The new machine is driving me nuts. The presser foot tension knob was broken off, they sent a new one. Now it is either eating thread or looping on the back. I have changed needles, thread, and bobbin cases, re-threaded, adjusted tension on the machine and the quilt in the frame (thought it may be stretched too tight). I can get it to sew well for about 3 minutes, then it starts skipping stitches and breaks the thread. Then sometimes it will get loops on the back (sometimes big, sometimes little). I'm at my wit's end. I'm going to ask them to send me a new tension assembly and see if that helps.
Does anyone have any more suggestions? Please, something. I need some wine.