CUE Software is broken, it has nothing to do with your other usb devices. Perhaps it's the motherboard USB controllers but not any connected USB devices. How do I know this? Because I spent the last 2 hours trying to diagnose where this annoying notification sound is coming from every time I startup my computer.
I disconnected all my USB devices and the sound was still there.
Disabled CUE on startup and no sound.
Reconnect all USB devices and no sound.
Re-enable CUE on startup and the cursed sound is back again.
ALSO my STRAFE Keyboard is falling apart, when I reset my pc and enter bios it does not work and the colours are stuck on the board. The keys are fading which you already know and the CORSAIR logo is peeling. How a keyboard can be so problematic I don't know.