The problem has to do with the frequency capabilities of the splitters. Typical splitters allow 50 to 900Mhz, Splitters for HD or digital TV run at a higher frequency. Get some that are rated for 2 - 2.5 Ghz or higher. Also the cable running to the cable modem for the computer need splitters that are rated for two way communication. Not all splitters are created equal. Since I bought better splitters I have a much better picture and no error codes.