@ComcastJosh this link does not address the issue. I am having the same problem. My devices are set up and personalized and I have time limits set up and every couple of days the devices show up listed as different devices with different Mac addresses. This defeats the purpose of setting up limits and accounts because the devices are no longer set to the parental controls and time limits I've set up on my personal accounts. I'm about to drop Xfinity because of this problem. The local library might be slow but it's free and I know my kids won't be sneaking online or watching porn.