I think I'm having the same problem, I got Comcast and the router will disconnect and say can't find IP address or something so I have reset and modem and router and that fixes for at most 2-3 days before it starts again
my RT-N56u with 1.0.1.8n firmware and comcast service running through a arris telephony cable modem just keeps dropping connection every minute, i've tried rebooting and resetting nothing is working, does anyone know what the trouble could be?