Hi Scott,
I have two thoughts on your predicament:-
1) When these changes occur, it might be worth checking the original settings to see whether the Rt.2 was switched to 'ON'
If so, try switching it 'Off', re-save then do a reload and see if it happens again.
2) As it is so important for your work, if I were you I would save everything to the Music Stylist which as you know cannot be overwritten unless you choose to do so.
When I had my KN6000 because it was an 'iffy' keyboard, I did this everytime I had a 'gig' saving all my tunes and/or their variations to a 'named' designated slot. Once you've loaded the MS page, you then have 80 sets which with the Music Style Arranger 'ON' will instantly change forward or back using the Fill-in 1 or Fill-in 2 buttons, or better still, using a Foot Controller.
I know I keep referring to the SD Favourite Songs but it really makes life that much easier. There are 40 Banks with 9 slots to each, totalling 360 places to save all your settings in any order you wish and if you go to 'SD Preferences', here you can choose how they are shown e.g.
1st-SD Play Priority: SOUND or AUDIO.
2nd-Song Select Method: FOLDER, ALPHABET,
NUMBER or SD-SOUND LOAD.
I hope you soon find a solution to your problem and when you do, would you please post it on this Forum as I, and many others I am sure, would be very interested in how your solved it.
Good luck! - Audrey