I've been using an Asus RT-AC66R for some time now. Been reputable and I keep the f/w up to date. I don't think I'm having issues with Comcast but wondering about my RT-AC66R. Suddenly no access to the internet via ethernet or WiFi. It's random and seems to happen during the day but I'm not sure. I have been thinking about replacing it and for my needs, this model seems(ed) to do well (would consider new brand/model and later 802.11**). This goes up to 802.11ac.