LinkSys E1200 IPv6 issues

Guys,
I just bought my E1200 LinkSys router, which have IPv6.
Its WAN port is connected directly into my Linux IPv6 router (eth1 have 2804:290:4:fffe::/64), Linux have running Radvd and DHCPv6 (properly I think). The eth0 of my Linux router also have another subnet /64, 2804:290:4:ffff::/64.
If I replace my E1200, for a Linux Desktop, for example, my Linux gets its IP from the DHCP and have stable IPv6 conectivity.
If I reconnect my E1200, it gets its WAN IPv6, which is 2804:290:4:fffe::1451. It can ping ipv6.google.com without problems from the router web interface.
At my DHCP, I've configured the following line:
prefix6 2804:290:4:100:: 2804:290:4:f00:: /56;
...within the "subnet6 2804:290:4:fffe::/64" declaration.
Also, at the Linux router, I routed the subnet 2804:290:4:f00::/56 to 2804:290:4:fffe::1451, since I'm seeing it at "Status -> Local Network".
My LAN and my WiFi clients, connected to my E1200 router, are receiving its IPv6! But, here my problems began.
The IPv6 connectivity from behind the E1200, is very unstable, it simple stops working after a few minutes. I'm using Mac, Windows 7 and Ubuntu 13.04, all of it have the same problem. If disconnect, and reconnect, IPv6 starts to work again and ramdomly stops...
What am I missing?
Thanks!
Thiagi

OUCH! I just saw this at my Linux system log (client of E1200):
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:100f:1ab5:3c30:a73c on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:62c5:47ff:fe03:8228 on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:38fe:b8d7:6b27:e2c6 on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:ca1:1e4c:b445:1de5 on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:2cfe:3eb0:9661:27fd on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:34e8:41a2:7f0d:3cde on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:30cd:2b4d:acf1:bffb on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:41d3:381:bdb6:fad on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:9ce1:d60f:9c73:b5ea on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:7d52:a3e5:227e:89fe on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:55e4:8319:2964:fda3 on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:613f:d696:91e7:47c2 on eth0.
Sep 13 11:34:55 zion avahi-daemon[1131]: Withdrawing address record for 2804:290:4:f00:bd9a:20ec:6af1:491c on eth0.
And Linux lost IPv6 connectivity again, BUT:
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:62c5:47ff:fe03:8228 on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:ca1:1e4c:b445:1de5 on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:613f:d696:91e7:47c2 on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:100f:1ab5:3c30:a73c on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:2cfe:3eb0:9661:27fd on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:34e8:41a2:7f0d:3cde on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:9ce1:d60f:9c73:b5ea on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:7d52:a3e5:227e:89fe on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:38fe:b8d7:6b27:e2c6 on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:30cd:2b4d:acf1:bffb on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:41d3:381:bdb6:fad on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:bd9a:20ec:6af1:491c on eth0.*.
Sep 13 11:35:23 zion avahi-daemon[1131]: Registering new address record for 2804:290:4:f00:55e4:8319:2964:fda3 on eth0.*.
...And Linux got its IPv6 connectivity back!
Maybe I can change this behaviour using E1200 admin interface?!
This can not be a isolated problem with my Ubuntu, since I have Mac, Windows and Android here, connected with my E1200 via Wifi and LAN cable, all of it behaves like this...
Any tips?!
Thanks!
Thiago

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    B] If you haven't installed Cisco Connect then you can log on to the router's user interface using it's default IP address in the browser which is 192.168.1.1 and type in 'admin' as the password leaving the user name field blank. This will take you to the router's web interface and then follow steps as mentioned above to make the changes.

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