Well, just a thought. Why not start something new on your other machine? It might be feeling left out since you have been using the "other" machine. Sewing machines have feelings too you know. They need to be petted, loved and used. Saying that, after I have quilted another top, I am planning on putting my main machine in the shop to be serviced. The poor baby has been running hammer and tongs for quite awhile and I think she needs some TLC. So, I have got out my "other" machine and have been doing bits and pieces on it - just to let it know she is not forgotten LOL.
Hope you get your baby back soon, my sweet. Dianne