Just a shot in the dark but a lot of keyboards allow for splitting the keyboard in half or even in quarters to assign multiple sounds... have you tried a total reset? Or explore the manual for setting up a split keyboard. Might help.
Testimonial: "Tried factory re-set and keyboard split - did not cure it. Must be a hardware problem."
SOURCE: No sound when piano keys are pushed on my Yamaha dgx-620
I'm sorry but it sounds like you will have to have it repaired professionally.
SOURCE: I have a Yamaha dgx
Two possibilities come to mind.
These footswitches DO go bad and require servicing (east to work on) either cable breaks someplace due to vibration and flexure or the contacts get dirty inside... simple to disassemble and clean.
The other thing is polarity. I know you said it isn't polarity, however should you be holding or not holding it down and the power glitches, the keyboard may read a NEW polarity. Often the power can be very "dirty" at venues. Also sometimes the power cord connector can become marginal causing momentary power loss... USUALLY you would notice this happening.
SOURCE: Which midi cable or USB midi cable should I use for Yamaha DGX 520 model.
It doesn't use a USB to MIDI adapter (such as the UX-16.) It has an onboard MIDI controller and uses a standard USB A-B cable. You just need to install the driver from the CD-ROM or here, and plug it in. You can get the manual from the same page or here. Setup is on page 99.
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