Hmmmm. I do know of a Northern River bluegrass band member who had a bad experience in wintertime Fairbanks Alaska.He says he'd had the Martin in its case in the truck for hours. Brought it into the house, took it out of its case and leaned it against a chair. Someone accidentally knocked it down and part of the body split into shards.
He had it glued together but he says that although he still has it, it has never been the same.
Ebbie