Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble, Ed.
Try pulling the batteries out and leaving out for at least an hour to let it reset.
If that does not help, it points to internal damage, but the next option would be to try reloading the firmware/programming, by plugging to your computer with the usb cable, opening the logitech software, and it will reload from there.
If you get stuck, let me know.
I hope that works for you as well. In most cases, it will do the trick.
If it does not, I can help you with the programming remotely if needed.