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Mine is pretty stable but anytime the cable modem gets fried by lightning the new one gets a new prefix. I wish it was tied to my account somehow.

That's because the DHCPv6 client in the modem generates a unique DUID for itself and the new one cannot know the fried modems DUID.

If your cable modem is regularly getting fried by lightning, you can get lightning arrestors inline on the coax connection.

I have one now but I suspect the lightning shall … resist arrest.