I am also getting this but with an AC68u - I have enabled the Respond ICMP Echo (ping) Request from WAN setting in the firewall and disabled DOS protection but no joy. Any ideas?
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Agreed, in most cases their ISP might of changed their dynamic IP, its also best to not use IPv6 if your ISP is BT, they change the IPv6 address so often its not funny.
I ended up setting up my own DDNS Service, so in the chances my IPv4 changes, my graph will be red only for one to two mins (if that) while it updates the DNS Record (that's if it works that is ).