“t” key is delayed and doesn’t capitalize

All of a sudden my "t" key is having issues. About half the time it simply doesn't work, other times it works but it prints delayed, so as I'm typing a sentence it will show up 3-4 characters too late, sometimes appearing in the next word.

It also won't capitalize. Holding shift (tried both of them) works with every key except "t." Caps lock results in every key being capitalized except the "t."

I have the same issue with an external mechanical keyboard so it's definitely not a hardware issue.

This is on a second generation Macbook (not Pro) wih macOS 10.14.3