I've got lots of cherry (maybe 500 board feet or more) rough cut 1" and 2" thick that I've had for 11 years. I got it from the original owner after he died. It was cut maybe 25 years ago. It was properly stored with stickers through every layer and the ends were sealed. It has always been stored inside (unheated).
My problem is that whenever I use a piece, it warps after being surfaced. A 10" board might have as much as a 1/4" - 3/8" crown a few days after being surfaced.
I've tried surfacing one side and waiting but no luck. I've heard of case hardening. Is there any solution?