Nope, problem remains. Not sure what's causing it because I find that once I can get one of the keys to work again, all of the "stuck" keys work again, until they all stick again. Any ideas?
I took each of the troublesome keys off, didn't find any of them messy (but each one had at least one small hair in there, if that could have done it?) but blew into them and softly scraped around as best I could and now they seem to be working again. I'll return with updates if the issue returns, as that seems to have been too simple a solve 😅