Not an expert but this is what I have gleemed from other threads, posts and the internet in general:
Chemical and physical reactions are slowed at lower temperatures.
Plastic may contribute to the taste of flavored e-juice with lots of ingredients but leaching or oxidation of PG or VG Nicotine base will be slowed by storing in the freezer. It takes a long time in the freezer for duck stored in ziplock bags to pick up a fishy taste from trout stored in the same freezer in ziplock bags. The home freezer is normally between 0F (hard Ice Cream) and 4F (Soft Ice Cream), which may seem cold but is no where close to the 'freezing point of a NIC/PG/VG mixture. Remember that this stuff is 'antifreeze'
Flavored juices contains other stuff. Cold storage in the refrigerator (about 40F) prolongs juice life, but this is not cold enough to prevent leaching. Chemical reactions are slowed, but may continue to degrade a flavored juice.
Glass is of course the preferred storage material for base or flavored juice. Breakage potential aside.
Transfer of molecules between the plastic and juice ingredients can happen but freezing (0 to 4F) has shown pretty good results for a year or two(except for flavored juice). Storage life is reduced by exposure time (just like milk in the fridge). Each time you take juice out, warm it up, shortens the storage life. Planning your purchases to buy and store bottles in "6 month" sizes, even if you keep 2 years worth on hand, will reduce exposure times. Implementing a First-In-First-Out storage protocol to use the oldest first will help prevent 'finding this old bottle of juice in the back of the fridge'.
Hurry and buy your Summer juice before it gets hot outside
