This appears to be a known issue as it was reported with latest Asus official build for RT-N66U and acknowledged by Asus Support. http://www.snbforums.com/threads/official-rt-n66u-firmware-version-3-0-0-4-378-9235.27622/
Upgraded from 1.0.1.1 to 1.0.1.9
I had a few free minutes today so I took the plunge and upgraded from 1.0.1.1 to 1.0.1.9.
One oddity- Ryzhov's script didn't have the 1.0.1.1 listed as a known version so I had to tweak one of the comparison values.
Upgrade went fine and so far the router...
Reboot
Try disabling HW Acceleration (LAN -> Switch Control -> NAT Acceleration).
I'm also on Comcast and ran into a similar issue. I've been running with HW acceleration off and the router's stayed up.
Uptime on RT-N66U
So after disabling HW acceleration, my router stayed up for ~2 weeks without a reboot.
Since Merlin released 374.41 beta1 today, I've upgraded and will see how things go with HW acceleration disabled during the beta. Post final release for 374.41 I'll enable and see how...
Feedback
FWIW- I can't speak to the Shibby / DD-WRT on Asus but prior to my Asus router purchase, I had a Linksys WRT54GS v1.1 if I recall correctly.
I ran DD-WRT on it for some time but finally got fed of up with their code quality - there were new beta builds coming out every day. It...
Random reboots on rt-n66u
I've been having some random reboots on my rt-n66u router running 374.40. Uptime between reboots varies but it ranges from several hours to several days. Usually wireless is able to reconnect, but there has been a few times where I have to power-cycle the router for...
Wap & dhcp
I have Zyxel WAP3205 running their latest firmware 1.00(BFR.7)C0. After I upgraded to 266.24b, it would no longer obtain the static assigned DHCP address. I just saw the DHCP offer repeating in the system log.
I ended up having to backrev to 266.23 where it's working again.
I...