I also currently have this issue, and the reason you hear it 'randomly' and sometimes when you turn (at least for me) is: The sound plays every time your viewer hears a sound for the first time after playing it.|
I have this with a HUD, if I play a sound (I have a few different types) when I right click, the sound plays again, when I open an IM window it plays again. When something in world makes a sound it plays again etc.
Unfortunately, no one else hears this, and I have made HUDs before and not had this problem. I have never used sound queuing, but I do use preload. I have even tried switching the scripts to another object and still have the issue.