Just came back from a Rogers store with my 2nd CGN modem and it did not fix my issue. Here it is:
I have 2 laptops in the house, each connecting wirelessly. Out of the blue the internet connection stops working. My phones and tablets still work, but the latops don't. I can ping every other device from these laptops, but I cannot ping them. If I do a factory reset on the modem, they work for a few days, then back to no connection. An ethernet cable connection works just fine. Tech support suggested a replacement, which did nothing.
It happens on both frequencies. The security is WPA/WPA2, encryptmode AES. Default setting.
One thing that I've noticed is that both of the laptops have an Intel wi-fi card in them. I have since joined a desktop and two other laptops to the network, which have other manufacturers' cards in them, and they work flawlessly. Could there be some sort of conflict between the router and the Intel cards?