It's random and not very often. I have no idea when it's going to do it.sounds like your picking up cell data signal in the speakers. leave phone at home and then see if it happens. or you have FBI tracking your car .. are you mafia?
I've heard that sound a few times when getting close to a PC (comes out the PC speakers) with a cell phone in my pocket.
It has me a little worried tho, if it's radiating that kinda signal, what it's doing to the 'boys' if it's in my pocket :smile: