I've been getting a lot of "PHP Critical error"'s when trying to visit the forums over the past couple days. Anyone else getting them? It seems to just happen randomly.

Do you mean MySQL errors? I've got them too, this can be solved if the forum were only php-based and not relying in mysql.

Sometimes the database server goes down. Perhaps they were doing an upgrade or an update or something.

I wouldn't worry too much about it though. It usually comes back within an hour or so.