nah, its a bug.
very little is known of it and i'm surprised that this is the first mention of somebody noticing it, as i've had the island running for about 3 days now:P
its the same bug thats causing Banana Land and Mars to be closed.
the only known solution is to delete the billings file (as thats where the bug is), which in an economy island, you'd be better off just resetting the whole island if you don't have a backup of it.