I would would be surprised if that was the cause because these tanks are in really secure, especially compared to my fresh tank that Keystone put in wrong twice (it dropped out twice--second time they payed me to install it because I told them I wasn't going to risk someone being killed by their negligence).
That said, I've heard these tanks just crack sometimes and I'm hoping that's not the case because they aren't cheap and it also appears they aren't being made anymore. I guess I'll find out once I have a good plan for how to cut the plumbing. I'm all for doing things right, but that's an insane number of joints going in on the left. They're not even all in the photo. There's not even a way to simplify it that I can see. Plus it's a tight space.