Insulation?
It seems to me that the cracking is the result of expansion and contraction.
(Villagetinkers "no wood behind" problem makes it that much worse)
It's easy to see that there is no insulation over the cracking areas in the garage. Cannot easily see if there is insulation over the lanai, but I'll bet there isn't.
It's understandable to think, why insulate over an unheated/air conditioned space? I'm confident that it has been insulated to the building code, but I think the temperature differences (sometimes extreme) on either side of that drywall both in the Summer and the Winter is the cause of the expansion and contraction, leading to the cracks.
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