There are numerous reasons why the game may be crashing but if you haven't installed anything recently or messed around with your files chances are it could be random crashes from the servers end or issues with the Internet signal on your end. If the problem doesn't repair itself within the next few hours or day then you might have to consider backing up your files, uninstalling the game, deleting your FH folder and the reinstalling FH again. (You'll have to get permission from your administrator to do so.) That's always the most simple fix for issues with the files that may be the source of the crashing.