Sound trigger - quits working after awhile.

I have a castle defense game i'm working on and i have a trigger set up so everytime a new wave of enemies comes, it plays a silly sound from the game, kinda like arkguils tower defense. all the sounds are basically pissed sounds from different units. heres how the trigger is set up:

(the first wave of enemies is clockwerk goblins)

events: unit - a unit enters playable map area

cond: unit type of entering unit = to clockwerk goblins

actions: playmortarteampissed 3
turn off this trigger

it was working but after a few times it stops for each level...

This cant be any complicated problem really; u probably have forgot to add new units or triggers. Like, instead of entering unit u accidently put (triggering unit) on each from the level it stops. Just check the difference between the triggers that work and those who doesnt.

I found out what was wrong so nevermind, sorry. I had somewhere along the line forgotten that you had to uncheck the 3d sound box. ^_^