Mine was doing a similar thing...ggggrrrrrrrr!!! Spent $100 to get it serviced and it still was acting up. Then somehow I managed to re-seat the bobbin case (for the 100th time it seemed) and it started purring. It's been good for the last 2 days...I'm keeping my fingers crossed that I can finish my quilt. I am looking for a new (used machine) because life's too short to have such a temperamental sewing machine. I do think having a stash of high quality dark chocolate is great during times such as these! Good luck!