Oh I am glad I checked this thread. I have experienced the sudden switching to edit mode. I think I'll do this board swap.
I would have been be a bit hesitant, but a few months ago the middle C key's aftertouch went hypersensitive on my less-than-one-year-old Subsequent 37. It would go into max aftertouch anytime you used that key. And since I use AT on almost all my sounds, and I use middle C pretty often too I contacted Moog. They were also very responsive (to phone calls, not email), and sent me a replacement keyboard. They did not require a deposit, but were adamant they get the old keyboard back. It did require some surgery, but nothing more than screws and some cable connections. 30 minutes going slow and deliberate. Well worth the effort.