I noticed this today while on my phone that I couldn't access websites while still being connected to my WiFi. My Xbox which is a hard line to the router was still working but all WiFi devices were not. I rebooted the router, the first time it froze. The second time around it my iPhone gave me a security precaution that I was connected to a hidden WiFi network which is then when I noticed the utopia.net on the DNS. Noticed this as well on my girlfriend's iPhone and my laptop. Tried going to the admin page, was super slow so then restarted the router once more and it reconnected to the Comcast DNS.
Since both iPhones showed this utopia.net DNS, it confirms the hijack is on the router and not on any of the devices. This doesn't add anything to this ongoing mystery but wanted to voice my displeasure since there is no answer of why this happens and how. Now I'm a little paranoid about if it will happen again.
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