I know it's been a while since you submitted this post, but I just stumbled across it during a search, as I have the same problem.
I found out today, that there is an issue with the early 820's and a different dealer told me that there is a fix for a few issues, and they have to send it back to Chicago. They are not broadcasting this, but I'm going to send mine in. Otherwise, I absolutely love it. That is really my only complaint. It even started skipping stitches in free motion mode without the BSR, which I have never used because of the issue.
I wonder if you resolved your problems. It's more then just a spring, because I've had that done too.