Why does the wind disappear sometimes?

I've had this happen to me a few times. I'll be in a game, and then randomly the animation for the wind will disappear. I've joined a few games also where the wind isn't there to start with. Not that big of a deal because I can still use the flags to see the direction of the wind. Just wondering if it is a bug or by design. It is actually entertaining having to use the flags to aim your sails. Could it be a possible option down the road?