I have a 40" Rigid LED I bought about 8 months ago. When installed the light, the last (4th) panel of LEDs would not light up. I moved it to another upfitter switch and then it worked. It will also not light up the last panel unless I have the motor running. Today I was at a car show and noticed my 40" lit up from left to right, first 2 panels, then the 3rd, and then the 4th. Now my 4th panel flickers. I've tried everything and it keep flickering. Can someone tell me if the light is defective or broken? Thx!