I agree this issue is not solved. I've been encountering this problem on my DPC394IT box for several months now. I can replicate the issue everytime I reboot the box. On my second reset, the DNS is corrected (probably because of the renewal as jason states). I can verify that this is not my PC or any other device infecting the router because I disconnected all wifi and wired devices from the box and reset it. I then hooked up my Linux box to check then.. boom, utopia.net. I tried using phone, Windows PC on safe mode.. same result Utopia.net after 1st box reset.
Edit: I just chatted w/ Comcast TS. I'll get my box replaced w/ an Arris box. Maybe that'll get it resolved.
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