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For all the people that started to lose their 2nd 5Ghz channel like I did, there is a work round, this is what I did, go to WAN settings and Clone your MAC address at the bottom of the Internet Connection Tab, restart your ISP's modem to gain a new IP if you are dynamically assigned one, this will give your 2nd 5Ghz channel its MAC address back.
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EDIT: After several reboots, it went back to the missing 5Ghz and the Wifi section went all corrupt with a missing left side, it make me wonder if some were made with inferior hardware. Anyway back to Version 3.0.0.4.382.15984 and it works as it should. I will wait to the next release or if a none AiMesh is released, use that.......I am a bit mift
Please report back if it worked.
Regards