I got a Cisco 891 wired to a DOCSIS 3.0 cable modem. Sometimes, we get power outage for several hours and the router and the modem are both shutdown. The problem is when they both reload the router dont get an IP adress from the modem. I have to reset the interface each time... I am not always there to reset the interface and someone at the job have to connect to the router and reboot it. Is there a way to prevent this ?