I would head back over there and tell them that its flickering on and off occasionaly and make them install a new LED kit. Perhaps you got a bad one?
I really wish there was a way you could return it. Randode's kit is single color, but its incredibley bright since it uses CCFLs, nevermind the fact that his customer service is great. I blew out two inverters in a month and asked him if it was possible that i had wired it wrong in an e-mail. After indicating how i had installed it he said it was riht and offered me some new inverters. I had some laying around from PC mods and didn't need him to go to the trouble, but it left me with the feeling that i had picked a good person to do business with.
Never had any more inverters go out so it was just bad luck