It would be interesting to see what your actual cable modem configuration looks like, for example is the device in pass-through mode, DHCP or Static Address, ect. I also didn't see it mentioned anywhere if you are running a split-tunnel or if everything is going through the tunnel. One of the things that I would look at is if the show vpn ike-sa gateway <value> or the show vpn ipsec-sa tunnel <value> still shows the connections as active? I'll also pull a Cisco and ask why they are still running 6.1.3, it might be worth upgrading one of them that does this more often to the latest 6.1.*, or 7.0.*, or even 7.1.* if you like to live dangerously.
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