For what it's worth, I never store opened boxes/envelopes/cans of film in a fridge for the reasons you've just found out. Sooner or later, it goes wrong. 120 roll film is of course notorious, but ultimately, nothing is safe if water is involved. I split 400ft rolls into 100ft rolls and once those get out of the fridge, they go into the loader and remain outside the fridge until they're used up. Film loaded back into 35mm cassettes and then put into a properly sealing/waterproof box sometimes go back into the fridge. The same for 100ft bulk rolls that are put into a plastic bag, taped shut and put inside a protective box. Something like a bulk loader with film in it with no additional protection is, as you've found out, susceptible to picking up moisture. Ultimately, gelatin is somewhat hygroscopic, so the film will just absorb moisture from the air and once that process has started, the film is basically toast.