Sound mod that does not work after the second game

It is just as the name implies. I am making a mod for radio chat and autoword. I believe I have gone through all the steps of installation. It works in the first game but after the second game it becomes silent and does not work. This was the same with my own mod and someone else’s mod I saw on the forum. If I restart the client it works in the first game but stops working again. Does anyone have any idea about this?