I have a Quantum Gateway router that has stopped broadcasting the 5.0 network. The 2.4 still works as before, but I can't get it to send the 5.0 signal. I've trired a factory reset with no joy. I suspect I got a bad unit, but I would love to know how to tell for sure (other than the obvious - it does not work).
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Cool. My Linksys WRT1900AC is a dual band router but I have just one device, a not-so-smart Samsung PDP, that can use the 5 GHz band.
Funny thing the Samsung TV supports both 2.4 & 5 GHz wireless connectivity but once I installed the Linksys router all my 2.4 GHz devices connected to the wireless network just fine, however the Samsung PDP would not connect to the router.
Come to find out when using the Linksys router the Samsung PDP will only connect to the 5 GHz band, but with my old Actiontec b/g router (and no Linksys) the TV's wireless worked just fine with the 2.4 GHz band.
BTW... I have disabled the wireless networking support for the Actiontec router and use it only as a MoCA bridge for FiOS TV IP services.