Just "play wav" action should not freeze the game. I would say submit your map, but the attachment system is down right now.
But, I guess it freezes because your trying ot loop it with "wait" actions and hypers or something. I suggest to use Death counters for looping instead.
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well i am now trying the death counter trigs and i dont no if i am doing them right can someone put it up for me in a easier way or meet me on sc in clan oo ill be named the same name as i have here