I've got a 2012 mazda 3 w/bose oem system that activates spontaneously at max volume with no particular pattern. It occurs whether the start/volume nob is on or not, it sometimes starts with a cracle/pop sound.:frown2: Please help with suggestions. I've been to audio shops that suggest it could be the amp under the passenger seat which has malfunctioned to the head unit having gone south. I want to fix this spontaneous outburst but keep the oem system for the least financial investment.