Reboot is about the only thing I could think of tryin' - ain't much of a 'puter guru.....but you might try Wolfie. Just texted him and asked for him to take a look at this string.
To be honest, as cheaply as these things are built nowadays, I suspect it's a mechanical issue w/the board itself. Thought I had a spare one here, but apparently I gave it to someone already, sorry. Just got a reply from Wolfie...he's on it...
I've had something similar happen in the past. There's a keyboard command (escapes me now what it is) but it turns on the vocal recognition. You can shut off the voice recognition in the control panel...not saying for sure, but it sure seems similar.
Have you tried another keyboard? It is probably a single conductor broken on the keyboard. There are x number conductors going cross ways and y number of conductors going up and down. Depending on what key is pressed connects x&y sensing the key being depressed. The problem is not in cabling or signaling if wireless. Is possible that you have a bad keyboard controller in the computer but not a likely. Have seen a problem with a bad keyboard driver before. Been messing with computers since 1976 with 110 baud modems, teletypes, paper tape and fat fingering. My how things have changed.
First try a USB keyboard, cheap. I use a wireless keyboard on my laptop when I'm using it in the shop or office. Could be just needs the cables reconnected inside.