Precision 7740 keyboard slow and glitchy

Remove the base cover and check the condition of the battery.  If it's at all swollen, remove and dispose of it outside your home or office immediately.  It's very common for keyboard or touchpad issues to be symptomatic of a swollen battery.

Nope, battery is new and happy.  I just had it apart yesterday to add a new NVMe drive.  The battery died about 3 weeks after the laptop went out of warranty - about the same time the keyboard composted.

Since installing a whole slew of drivers and whatever a month or so ago, the keyboard was fine again, and worked PERFECTLY 'til Windows forced me to install 23H2, I presume the problem is something that got installed a month ago and messed up by Windows.  Now I just need to know which one it is, or idiot-proof directions to tell the site to install EVERYTHING whether it thinks it already has the right "whatever" or not.

I don't care HOW it gets fixed, I just need to be able to put in a password in a meeting WITHOUT looking like some incompetent - I have a lot of better ways to demonstrate that!

I THOUGHT I sent this yesterday, but I don't see it...

Battery is fine.  It's new, having been replaced about a month after the laptop went out of warranty.  As near as I can tell, the mouse is fine, and nothing else is acting wonky, but the keyboard not responding randomly is incredibly aggravating!  It's not always the same letters, and it seems like things like ctrl/C don't work at all.  But that's a guess.

Again, it started acting badly, then I went out to Dell and updated a whole slew of things including a firmware update, and it worked FINE again.  Then, immediately upon installing Windows 23H2 update, it went back to being virtually unusable.  Putting in a long, alphanumeric password I can't see is "interesting".  Can somebody tell me WHAT drivers or whatever need to be updated or reinstalled?  Even if it's "update everything".  I need some kind of clue  'cause it stopped being fun in meetings, the first time it happened.

This isn't in any way "scientific", BUT I booted into the BIOS and went to Add Boot Option, then typed in that line.  No glitches that I could SEE.

Booted the system and opened a command window and typed in there.   Again, no bizarre behavior and things appeared to work.

Opened a text editor and did some typing and things appeared OK...

BUT, in the text editor if I selected some text and copied it with ctrl/c then moved and pasted it with ctrl/v it MIGHT not paste the first time...  OR, it was just slow for some reason and I hit ctrl/z before it worked.  Additional pastes were fine.

I ALSO found that Alt/Tab to switch windows USUALLY worked, but not always.  Sometimes it did nothing.

THEN I opened Word, and the behavior came back.  I could start typing and some letters were not "typed".  Pressing a letter repeatedly would eventually get it to type.

I'll have to experiment to see if the problem I believe I was having typing in passwords is still there or not.

BUT, I THINK it may not be the Dell keyboard driver, but rather be something from the 23H2 update OR something that is not working properly in MS Office since the two places I KNOW I saw the problem was in Word and Outlook...

I'm going to try a Windows forum 'cause as I suspect most of us have learned, contacting Microsoft for help on ANYTHING is pointless.  I'll see if I can find anything useful in that direction.

Wound up replacing the keyboard.  Appears to have worked.