There I was at wonderful Shawn's Archery, having fun with all the great good people, playing with toys that I love, but my arrows were just going everywhere. So every shot, I was going through all the stuff that I've needed to work on in my head. It wasn't helping. Shawn comes over and goes, like, "How's your grip feel?" And I smacked my head because I was gripping totally differently from usual, with a high wrist.
I dunno why you can do the same thing for weeks - months - many months and then your body just decides to do something different all of a sudden. On the up side, it's nice to find an easy fix for it.
Taking the subway, an analogy hit me:
When you're holding onto the pole of the train, you usually, comfortably, grip it with a low wrist. All the meat of your thumb is snugged up behind the bow - er, pole. Absorbing as many germs as possible, right?
When you're on the train at rush hour, and you have to reach over somebody's shoulder to hold the pole, you might have a high wrist. You've just got that little bit of web between your thumb and forefinger on it and you've barely got enough stability when the train pulls into a station. And heaven help you if you're carrying a heavy bag and wearing boots with heels.
Mind you, you don't close your fingers around your bow (it's more accurate to say you want to support the bow, I guess, than grip it), like I hope you do around the pole. I don't want to be at fault for you falling in someone's lap.