Ok we're in the same boat here kind of re-mumble situation. Infact I'm postive we're both having the exact same issue, web page slowdown, the mumble crashes, but still on in the game.
Doing reading all night and just seems the Routing funcationality in CGN3 is just...
Atleast I have the option to pop my old router down which i did but dropped me from 250mbps down to 30mbps, it's a new 10/100 router i bought a month ago before realizing rogers went wide with the Hybrid system months back. ( I should have kept up with the upgrade i would have spent the extra 10$ for gigbit ports).
I feel i have no choice but to buy another router... btw the disconnects in mumble etc stopped when i went bridged.
Absolutely no way you can plop a router down and have everyone connect to it? If you try to plop it down as well without bridging the CGN you're gonna end up double NATing.