Lost IPv6 for past day

Hello folks, this is a pretty minor issue but both me and my work's Comcast connections (work is Comcast Business) have lost IPv6 access since yesterday. Both routers still receive the expected delegated prefix, but have no routable access and respond to all IPv6 queries with an ICMPv6 error indicating no route. I've posted a packet dump of the WAN interface of one router, and you can see a successful DHCPv6 request/reply, but what you can't see are the normal ICMPv6 router advertisements coming from Comcast's end. IPv4 has remained working normally. Just posting it here in the very remote chance that someone at netops takes a look. Thanks

/home/router # tcpdump -pnqi wan ip6 
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on wan, link-type EN10MB (Ethernet), snapshot length 262144 bytes


02:49:12.001232 IP6 fe80::8ea6:82ff:fe70:57bc.546 > ff02::1:2.547: UDP, length 212
02:49:12.061865 IP6 2001:558:4013:44::10.547 > fe80::8ea6:82ff:fe70:57bc.546: UDP, length 149
02:49:12.075402 IP6 fe80::8ea6:82ff:fe70:57bc > ff02::16: HBH ICMP6, multicast listener report v2, 5 group record(s), length 108
02:49:13.068695 IP6 fe80::8ea6:82ff:fe70:57bc > ff02::16: HBH ICMP6, multicast listener report v2, 5 group record(s), length 108