I would love to stop renting Comcast's over-priced modem, but those fuckers' gigabit service is extremely unstable in my area and causes both my Arris SB8200 an

I would love to stop renting Comcast's over-priced modem, but those fuckers' gigabit service is extremely unstable in my area and causes both my Arris SB8200 and NetGear CM1000 modems to constantly hang. I have to reboot my modem at least 2 or 3 times a day, no matter which one I use, and sometimes every 20 to 30 minutes. I haven't tried the Motorola MB8600 yet, but I'm kind of weary of dropping another couple hundred dollars on a modem that isn't guaranteed to work. Comcast's router at least stays up for more than a day at a time, but of course I'm only getting 400 to 500 Mbits down on my gigabit service. I'd leave Comcast in a second but the only other option in my area is CenturyLink, with their whopping 20 Mbit speed.