I have installed three or four of these systems and they have been flawless. Got one for my new boat in Aug. and finnaly got the courage up to start cutting holes and installing it. Got everything hooked up and checked out fine, except! speakers shut down after a few minutes and emidiatly if I go above 70% volume. Power light remains on the hub but seams to kick off the speakers like an overload protection. The unit gets warm within 5 min. And it shuts off quicker the longer it is on.Think I may have got a bad Sonic hub? Thanks for any ideas.