FS...I experienced similar problems with the X1 when I had it.
Something I discovered in the SD1. Within the parameter settings there are several places to adjust the same thing!! For example Vocal volume settings. You can change Mic volume within the In-line effects, Mic setup, and in Vocalizer Edit and they all affect one another. I think (and I am still not sure of all things with this KB, No Ligit Manual as yet!!!) if all settings do not match, it will not hold when stored. Let me know if this makes sense!