I have improved mine by using
A) a better quality USB cable, the one supplied wasn’t the best.
B) block the 5V rail on the USB either with tape or a USB PortaPow USB power blocker.
C) Ferrites on the USB cable
D) Move the Sonic Pad further from the printer.
I have only done A & B but seems to work I am also using the rear ports. C & D I have not tried but I am guessing some form of induced signal from the powersupply/mainboard.
Key 92 is peculiar to my machine then, so a red herring.
Randomhero180 had a similar issue but I don’t think he resolved it short of a replacement.