My truck is an 04 with the bose system, at times all my front speakers dont work. I will go out and get into my truck and the front speakers and tweeters will not come on. The sub and rear speakers will still work. Then i can stop somwhere come back out and all the speakers will be on. I just got it back from the dealership and ofcourse the whole time it was there all the speakers worked, so they couldnt find anything. I am thinking it might be a channel going bad in the head unit, but i am not sure. Any ideas? also my system is all factory.