Help with Asuswrt-Merlin with ipv6 TWC/Spectrum

[mbze430]

It seems like a few months ago, my ipv6 stop routing for unknown reason(s). Before anyone say it's Windows 10 AU problem, I have tested with Android and an Apple computer device. It has the same problem not routing out via ipv6

My client machines get valid ipv6 address from TWC/Spectrum, as the router are being assigned.

However none of the clients can traceroute or ping beyond the router, BUT! if I ssh in to the router, I can ping -6 ipv6 address...

From router:

ASUSWRT-Merlin RT-AC3200 380.62-1 Thu Sep 29 00:19:40 UTC 2016
admin@RT-AC3200-C1F0:/tmp/home/root# ping -6 google.com
PING google.com (2607:f8b0:4007:807::200e): 56 data bytes
64 bytes from 2607:f8b0:4007:807::200e: seq=0 ttl=47 time=352.656 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=1 ttl=47 time=353.724 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=2 ttl=47 time=356.544 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=3 ttl=47 time=362.750 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=4 ttl=47 time=368.283 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=5 ttl=47 time=359.710 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=6 ttl=47 time=352.762 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=7 ttl=47 time=352.391 ms
64 bytes from 2607:f8b0:4007:807::200e: seq=8 ttl=47 time=363.462 ms

From LAN Client:

C:\Windows\system32>ping -6 google.com

Pinging google.com [2607:f8b0:4007:80b::200e] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 2607:f8b0:4007:80b::200e:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

Any suggestion getting it to work again would be great