What is the light intensity? How long are the lights on (daylength)? What is the temperature?
Can you take a photo of the centre of the fan from relatively close above it? Is there a small leaf visible in the centre?
Although the crown is firm, is it possible that the roots have died - could those pots have been over-watered?
I don't see a new sprouting leaf in the centre of the fan, which I would expect to see if the fan is actively growing. It looks somewhat as if the fan had stopped producing new leaves quite a while ago and that the leaves it had produced are reaching an age at which they would die and dry up. If that is the case then that would mean the fan is dormant.
