I thought I was going to have to replace the keyboard on this laptop, which would be a huge pain because apparently the laptop is basically constructed by attaching things to the keyboard (!!!), but I spent a bit of time figuring out (with the help of this actually pretty good video) how to pull the keycaps off without breaking anything, cleaned out the gunk (and it turned out there was a lot of hair and dust), and now I no longer have to type my passwords multiple times before they are accepted! 😁 😁 😁

I'm quite surprised that worked, actually — from the symptoms, I had thought replacement would be the only fix. I've only done a few keys because it's awkward, but I suspect if I do more it might improve things further!