I'm not quite sure how to check the firewall ;-; Sadly, I'm not that technologically advanced when it comes to technical computer stuff, but I do know that my internet has been fine recently. Like, I haven't touched anything recently, so why this is happening, I don't know. Though, it's not so much crashing as it is losing connection from the server.
As in, when I go back to the page where you need to keep open while you play, it's always blank when I get kicked off and I have to constantly input my user/password in.