Is your 655 router WAN IP getting a private or public IP address? Public looks like ##.##.###.###, private is a 192.168 addr.
I presume that if the connection is still going and it's just showing up in the logs and the time resets, the router is doing what it's supposed to. However makes me wonder why your ISP or there modem keeps changing IPs on you every 7 days or so. I would ask them to see if thats normal for them to do that. I think most ISP change IPs 30day or more. Just depends.