A couple of years ago, I posted on the forum about my frustration with the BSR on my 440QE. It just never seemed to do what it was supposed to - the unit would race so I would get gazillion teeny stitches or it would almost stall out on me. After having taken it in a couple of times with no successful fix, I just threw up my hands and stopped using the BSR altogether.
I picked up my machine today after taking it to a different place for cleaning, maintenance, etc. and before I left the store I asked if I could try it out and maybe the store personnel could tell if I was doing something wrong. Well, I might as well have been using a brand-new machine. For the first time in its life, the BSR worked beautifully. Problem solved, don't know what it was, but I suspect the fix was in this latest upgrade. Thank you Bernina and a huge thank you to Pamella's Place in Genesee Depot, WI.