Does the learning curve ever stop? --- What can happen to them in the fridge, MK?
I've been keep everything in tupperware in the fridge - no problems but just have to wait for things to reach room temp.
I threw out ALLLLL those Vodka washed cartos after my refill disaster and once I can't hear the fizzle sound, I figure they're shot, usually by the 3rd refill. It's also enclosed cotton not an open cotton ball. That's gotta make a difference esp in something air-tight but I don't know.
(it actually wasn't hard washing them out and despite my jokes, the vodka was the only thing that worked on the CMF & WOWboy carts) - the rinsing and air drying works if you don't expect them to work within the same day or several

but, I was so freaked out about it, I just tossed them all thinking I broke them all!)
Just don't get what you mean by going 'bad' from fridge temps. The heat part I get. What it'd do to his juice?
I've read so many differing opinions - maybe now's a good time to leave the fridge half open and let the frezzer defrost?
(and, yes! Drinking a lot of water here. I've been unusually thirsty since quitting. Can't explain craving water but, glad I'm not the only one on that too!)
I just find it strange that after a month my body hasn't gotten all that analog junk out enough. And don't feel wimpy about the mg's, MK. I noticed a slight change and sometimes the some higher mg's just plain make me feel sick to my stomach although they taste great and others need the CoolCarts. I'm all over the place with the mg's and hope in the next month or so, to get all of them lower. I still stealth vape a lot all but the menthol and peppermint. Then again, I was a heavy smoker. It's a big adjustment for me my body is fighting against, sometimes.

(I have a shelf full of anti-acids I'm going through like candy

) It's got to take a few months to get used to, imho.
The fridge is not the best place to keep them. One fellow had his stash go bad from it. I suggest keeping them in a cool dry place. I keep mine (cartos ) in a plastic cross stitching box (it has dividers and is not airtight). on my bookshelf. my liquids are in a small faux suitcase (cardboard) on the same shelf..out of the heat and sunlight.
Yes you can get mold..in months, it doesn't happen overnight. Some of my cartos are 7 months old and have been filled countless times..washed a few times and dried out. P.G. kind of works to keep the mold out. I always check for heavy discolorization..not due to vaping darker colored liquid. DIY liquid wall also discolor the filling stuff. I learned this from when I used a 901 and was forever washing the filler out to change flavors.
I cough or sneeze from time to time with tobacco flavors..they kind of tickle my throat. I also get dried out which makes me cough. Drink plenty of water or juice. Chewing gum or having a hard candy works too. Another thing that makes me cough is higher nic..I am a wimp and only vape 11/10 mg or less.