Since you asked...this is what was still happening after owning the SD7 for two months. No remedy was in sight. The right hand would just go "out of tune" with the left hand chords. They kept promising updates but they did not come so I had no choice but to buy something that worked right.
This was recorded live on a job. How embarrassing do you think that was? It happened once or twice a night.
https://app.box.com/s/4a4rvha5zah718ubi3iuqyhnce9gauuw