Hi Bachus
Sometimes the fluctuation of electricity we may not sense it, but, the instruments may, and perhaps for that reason, from time to time, I do a "soft reset" in my Genos, or for that matter, to anything that has keys and a Yamaha logo, before you turn on the keyboard, press and hold the highest key while turning it on.
I guess is what you did to restore the "normality" in the Genos.
Manuel