Sorry to necro, but I'm getting the same problems with N66U on 18.104.22.168.374.720 bought 2 days ago. I'm getting disconnects as frequently as every few minutes, up to maybe 2 hours if I'm lucky. I did not have these problems at all with my EA2700 before.
I'm in Hong Kong, using 100Mbit Netvigator DSL via the ZTE ZXDSL 931CIIA modem.
Strangely FW I'm running lists this as one of the fixes (http://support.asus.com/download.asp...+(VER.B1)&os=8
- Fixed HK ISP DHCP connection issue.
The router had 22.214.171.124.270 out of the box however, which also had the same problem, so I don't believe the most recent FW to be the cause.
Has anybody ever pin-pointed the cause of this or a way to fix it in a custom FW? I'm leaning more towards Tomato at this point, however I'm really not bothered which I go for if I can find an FW which solves the disconnects.