While playing the game on one of the built in tabs I go to the forums on another built in tab. If I wish to refresh the forums to see if anyone has posted on the latest post I would lose the battle pirates tab and would refresh the game as well. Also when clicking on the link to bring me to sub forum that Bean suggested it lost the battle pirates tab so if I click on a link I would lose the game and have to go back into the game. Can you make a refresh button within the forums like the one google chrome uses so only the forums would refresh and separate the games some how for when I click on a link or else there is no point playing on your website as I wont be able to use the forums to a degree I would like to while playing battle pirates and might as well just use facebook which I would rather not.
So... Confirmed, a memorial, or generally any large gathering could cause problems, as the available resources on the server are finite.