I've had this happen a few times. I even mentioned it to my doctor and he said this happens quicker if you are dehydrated and hot. He recommended when playing to not drink any alcohol but just water and even better, that salty electrolyte stuff that athletes drink.
Well, I took his advice and it's not happened again. Also, the shape of the neck on a guitar can make a big difference. If the cramp still happens I would experiment with a different size and shape of neck.
By the way, I play one-man reggae mostly and use a looper so when my hand got stuck on F#m, yes, I remember the chord, I had to make up a whole new melody on the vocals to fit to this one chord until I eventually faded the looper out,ha, ha. Funny now but painful and embarassing at the time.
Try the salty drinks, worked for me.
Gordon.
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