Freezing marijuana makes the resin glands brittle, and the trichomes will easily break off if the container is moved. The simple fact is, you lose THC when you freeze your bud (the THC will still be there, but it'll be tough to gather and smoke, as it will fall and look like fine pollen in the bottom of your container) Freezing your bud IS good, however, when making hashish, for this very same reason.