It's my muscle memory. I keep hitting n and m instead of space or backspace more than anything.
I feel your pain bro. Have you tried the swipe typing feature? When my fingers go retarded I switch to swiping for a bit and move on
I used Swype back when it came out and then swipe when it came to the stand Google keyboard. I don't know why but I find myself randomly switching between the two. Maybe if it's super important I'll type normally, but if it's quick or I'm in the middle of something else I'll swipe? I dunno.