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Netgear have released a firmware update that has among others fixed: "Connectivity issues with ISPs using DHCP (e.g. Comcast)". these Comcast users must be thanked for *pushing* Netgear to release the fix. the update seems to have solved my problem - no disruption after two days of usage.
so if anyone who has this problem and stumbled onto this thread, you know what to do.
Interesting, but DHCP errors are all-or-none, and your hiccup was protocol specific. I can't help but wonder if this is a Comcast cover story since they got smacked by the FCC for Bandwidth-Throttling which choke-ed out certain protocols a while back.
(Cable) broadband companies in general, but Comcast specifically was Traffic-Shaping people offline based on ports & protocols that they felt were (*Snicker*) "Optional"...