I'm wondering if you cap or close the wine bottle while in the refrigerator ?
I use a vaccuvin to pump the air out of the bottle, although if the bottle is at least 3/4 full, a stopper is fine. See my next comment:
Also I assume there's no worry about removing your airlock and pouring any savings back into the carboy ?
There is a lot of misunderstanding regarding O2. Oxidation is a factor of wine volume vs headspace vs time. A small volume of wine with a large headspace oxidizes faster than a large volume of wine with a small headspace. Oxidation occurs over days, weeks, and months, not minutes.
There is no danger in popping the stopper for a few minutes.
This does not mean anyone should be relaxed about air exposure. I limit unnecessary exposure, and when working on wine (e.g., racking) I try to accomplish tasks efficiently to reduce exposure.
EDIT: Also note there is a huge difference between active fermentation, post-fermentation outgassing, and outgassed wine. Yeast uses O2 for reproduction so it's beneficial to ferment in an open container, and to stir/punch down the wine at least once per day.
Outgassing wine is producing its own layer of protective CO2 that is continuously renewed during the outgassing period, so a larger headspace is not damaging. Some kit vendors state that topping up the carboy is not necessary, but they also indicate bottling within 4 to 8 weeks of starting. There is strong evidence the wine is safe
during that period of time.
Me? I top up within a week or 2 of the end of fermentation. I typically bulk age all wines longer, so any protection by outgassing is long gone. Plus, when I see the carboy is full to within 1" to 3" of the stopper, I know how large the headspace is. Counting on invisible gasses to provide protection is not within my risk tolerance.