Hey guys, I just bought a used Galaxy 959 which I have hard wired to a 30 amp fuse box in my truck. When I power on the radio the LCD does not come on. I can only hear a very faint hum. I discovered that if I turn the radio upside down and shake it that the LCD screen will light up and I can hear radio traffic. It will continue to work until I go down a rough road and then it stops working again. Is tgere anything simple or obvious I can check or do I need to ship this unit to a CB shop? Thanks!