So I've been playing New Vegas for a while now and at random times in random areas this clicking sound getts louder and louder and it happens in manny areas throughout the game I have suffered through it for a long time but it dosent always happen at the same areas. What is causing this and how do I fix it. If I can't fix this I may stop playing what I think is one of the best games I've bought in a while so please help.

thanks for all the help guys