I think a lot of people don't realise that just sailing your boat can cause wood warping problems.
Ok, if it is a plank on frame, people always seal the inside woodwork and if a different hull material, they seal any engine bearers and battery boxes. What they usually forget is the underside of the deck, because this is fitted after the basic hull is done and dusted.
I always seal under the deck before fitting, usually two or three coats of sanding sealer is enough, and as a security measure I use a permanent marker to put name, date and postcode in a few normally inaccessible areas, you need a mirror on a stick to see them, before sealing.
If you don't seal, all the little drops of water that invariably get inside and can't be mopped up, create a damp atmosphere actually inside your model. Warping and rotting from the inside out, and corroding all your electonic bits. Leaving an air gap by lifting the superstructure during storage can solve most of the problems, but not all.
John