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I agree. I have two, one in each tank. Sometimes they stay closed for days on end and then open right up. I noticed if debris builds up on them or if there is is inadequate flow, they go on strike.These corals can be very temperamental sometimes. Assuming your parameters are within reason just provide the coral with plenty of light and a lot of chaotic flow and it should open up in no time. Also, these corals will shut down & shed a waxy layer from time to time. That might be what's going on here. The link below goes into some detail about this I believe. GL
http://www.advancedaquarist.com/2013/3/corals