HCA: Hermit Crab Association

Has anyone had all your crabs molt at the same time? I think that's what mine are doing. I have 4; 3 bought at the same time on July 5 and one a week later. One of the original 3 did a top molt almost immediately. The past two nights I can tell they haven't been near the food or water dishes, nor have I even seen them since last weekend. Is it possible they are all molting at once? And the one (a medium E) again so soon?

its possabile or they could be destressing i had 3 of mine all molt at the same time

I have had 12 out of 15 crabs all molting at the same time in the past. I was lonely!