Hello,
I've looked for this problem and I thought I saw someone else mention it, but now I can't locate it. On my Almond+ when I did a factory reset and setup my wifi connections (Same SSID and WPA2 key) initially everything works great. My HTC One connects at 433 Mbps so I know AC is working fine. However, after an hour or so OpenWRT reports that the signal for wlan0 shows up as 0% and my phone only tries to connect to wlan1. I added a deny MAC filter for my phone to wlan1 as a work around and it connects to wlan0. I wanted to know if this is one of these two known issues listed in the Firmware R065 post:
5GHz Wi-Fi disconnects on some devices
Wi-Fi performance is still not optimized
Also, is there a better way to force a client to use a particular interface? Hopefully this work around will help people using the same SSID to get AC speeds.
Thanks.