This is more so an anecdote that (might?) soothe your fears.
Firstly, you're so lucky!! That your other 3 balls haven't gone off feed. I remember the first year my girl fasted. I worried like crazy. It started in November. She only fasted a couple months then, but the next year she fasted for FIVE months. This will be her (she hasn't started yet, but it's not quite time yet) 4th year fasting over the winter. She fasts like clockwork, it always starts in the period of the same two weeks. I live in a basement too - she gets artificial lighting, so I assume they must have this incredible instinct that can tell the changing seasons.
I do still get anxious about it. But during that time, I'll offer food once every two weeks. I just check that she's otherwise still normal and healthy. As long as she's drinking water and not showing signs of other sicknesses e.g. wheezing or mites or etc. and if she doesn't appear to be hunting aggressively at night, then she might just be fasting! She'll come out of it when she's ready.
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