I had a lot of problems with my Bernina 430 skipping stitches while I was quilting. I ended up switching to a denim needle and that helped a lot. I don't have the BSR, but mine did skip stitches when I was using the walking foot and just quilting.
I also found an area where I wasn't cleaning the lint. The little metal plate where the needle goes up and down (that has the seam markings on it) will pop up if you push on the corner and there was a HUGE amount of lint under there.
This is an interesting thread!