Ring of Slaughter Crashes and often Freezes on PC


every time i play Ring of Slaughter via the quickfinder in the startmenu my game freezes or crashes to desktop. If I play with my friends from friendslist instead, everything is fine. So i checked the networks settings on my router but corresponding udp ports are released.

Does anybodyelse have these issues and problems with the game on pc?

Sorry for my bad english.