Multiple letters with single key press.

I've been having a problem with multiple characters being entered with a single key press. It's intermittent. Computer is a Dell 5406 with Windows 11 installed.

I've uninstalled the keyboard and let the drivers reinstall. Same problem. There are multiple HID keyboards showing in Device manager. One PS/2 keyboard is listed there.

Windows is updated. SFC /scannow runs without errors.

I've installed all the recommended drivers from Dell.

I've lowered the character repeat delay and rate in the keyboard settings.

As I've been typing this, the problem occurred during the first sentence but now it's typing normally.

Anyone got any ideas on how to keep this from happening?