Well I think I may have found it! I hate to jinx myself by saying that.. but it has been about a week now and all is good. I went back again to the Netgear N600 and all was fine, except one day I went to run an Internet gadget on my main TV - which has a hub linked back via Ethernet to the main router (N600 or 826L). The TV would not pull an IP address. Everything else on that hub was pulling an IP (DVD, Game console..etc). I power-cycled everything on both ends - still no IP on the TV. Now the N600 has port lights and the port for that feed was blinking on and off. "Flapping NIC" - which was one of my original theories, but there are no port lights on the 826L (and I don't think there is even a way to see what ports are running at what speed - is there?) so if that was happening I'd never know it. Well I put a static on the TV and all was fine and the N600 stopped flashing. Now I should note here the N600 was not affected by this flapping on either the wireless nor other hard ports. Even though this port was flashing, all the other devices connected to the N600 ran full speed, including wireless.
SO I thought, maybe that was the issue with the 826L and put it back online. I kept the static on the TV but also reserved it in DHCP AND I turned off the DHCP "Always Broadcast" (compatibility for some DHCP Clients). I upgraded the firmware to v1.3 (I didn't seen any major changes in the jump from 1.3 to 1.4 and am still a bit cautious about that build). And so far, so good! The way it has been reacting in the GUI to date, makes me feel pretty good, like this might last.
Is there a way to see the speed/duplex settings of the hard ports? If not, this would make a good enhancement request. The N600 shows this in the Stats Screen and also has the port lights - since the 826L doesn't have port lights - having this on the Stats screen would be very helpful. I might have seen a speed change or half-duplex on that hard port.
While I still think I need another couple of weeks to declare victory - I think this is looking good!
