If it's cold where you are that might be the cause.
To promote growth try watering with luke warm water rather than cold water. I find at this time of year the water straight out of the tap is really really cold. Luke warm water seems to promote root and leaf growth in some of mine which were struggling.
I'm using cold water on the healthly ones that I want to flower, initially I was using luke warm water on them all after noticing that it helped root growth on a sick one, but it may be the reason mine have not spiked this year.
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