Freeze's on arena

Hello, I have terrible problem, always if I join on arena I got freez and need restart game, only on arenas it happens. Where I can looking for solve this problem?

Are you using any arena rated addons. If yes try disabling all and check if the freezes stop. If they stop start enabling them one by one to figure out what addon might be the cause

Thanks man, u help me a lot, its work now !