Interesting, faint, mysterios sound from somewhere up front.

Hi Guys,



I have this interesting, faint, mysterious sound from coming from somewhere up front.



It sounds like something is loose and smacking something somewhere (almost like a loose strut tower - but much quieter). It's under/outside/in front of the cabin (I'm pretty sure). It's not very loud at all. It's not turn, stop, go, or (necessarily) bump related (although it does happen mostly on small bumps - but it's not exclusive to bumps).



Really weird, I know.



Any ideas?



Thanks