Maybe the last few batches haven't carbonated as well because your house is colder now that it's winter?
In my last apartment, we kept the thermostat at 60 while we were at work and asleep, 66 otherwise. The beer was kept in an unheated closet with 3 outside walls, it probably saw 55-60 degree temps. I had a few batches that didn't carbonate until I built a little heated box in the closet to keep them around 75.
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