Vizio E3D320VX TV will not connect to Cisco Linksys E4200V2 5Ghz N-band

Hi just got a Vizio E3D320VX TV and it will connect to my E4200V2 2.4Ghz N-band, but not the 5Ghz N-band. Both 2.4Ghz and 5Ghz are configured virtually identical: 1) both are Wireless-N Only, 2) both auto channel width, 3) both WPA2 Personal security, 4) both SSID broadcast disable.
The only differences are: 1) obviously the SSIDs and 2) I manually set the 2.4Ghz channel to the least used in my area. I kept the 5Ghz channel auto.
To connect to 2.4Ghz, in the Vizio TV network settings, I left their settings to Auto (DHCP), and put in the SSID name. The TV searches for it, sees that it's WPA2PSK and asks for the password. Put it in and boom it works.
When I try on 5Ghz (again on "Auto"/DHCP for the TV), I put in the SSID, and the TV "thinks" about it for awhile, then says something like "Cannot connect, please try another Wireless Access Point". It never gets to the point where it asks for the WPA2 password.
The TV is downstairs and the E4200V2 is upstairs, but I used my iPad2 in the same room and it connects to the 5Ghz with no problem. But just in case the TV has a 5Ghz reception problem, I set the channel width to wide/40Mhz and bumped tried a couple of the higher channels (149 and 161), and it still won't connect.
I also went into Administration and turned on logging to try to see what is happening when the TV tries to connect, but for some reason nothing is logging, not even my other devices' traffic -- very strange (yes I hit Save Settings after enabling logging).
I saw another post about a Vizio Blu-ray player that was having streaming problems, and the suggestion there was to adjust the MTU, but I'm guessing that's irrelevant to my issue.
Anything else I can try to try to get it to connect? Thx, John.

Hello,
Try the one suggested by jlbjlb, name the 2 bands differently as well as the wireless channel so we can do some isolation.
For the wireless channel don't use auto, you can play around with 40MHz or 20Mhz then try connecting again.
So you'll be sure also of the adapter's wireless capability is its dual or not built in to it, perhaps you could ask the manufacturer.

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