I have a avic z1 installed for sometime now, but it seems like when i drive my g35 and its cold out well most of the time. if i go over a bump or take a left turn my right front passenger side speaker goes out and i only can hear it on my left side. is it the winter with a bad connection? i have had this problem before i opened up the center console and tightened everywhere. What is going on its so annoying. The speaker harness is secure to the door panel also. Seems like when i bang the right side of center console near feet the speaker will turn back on or if i turn up the volume.