I primarily shoot sheet films, so my experiences are based upon that. When I first tried shooting B&W cut film (like Efke PL100 and Delta 100), I found that the sheets would stick together if I didn't put them back into the box with the interleaving paper - I didn't try put into the freezer after that. I also didn't try to put the film into the freezer right after unloading the holders. Most of the film I shoot is QuickLoads, which I don't refrigerate. I tend to err on the side of caution.