I did not have time to come here and reply, but before the end of october I started to lose the WiFi signal with my phone. It was connecting, waiting 3 seconds, disconnecting, connecting an so on. I tried the 5GHz connection, it was working there but the signal was fluctuating a lot.
I rebooted the router from the web interface, and the same thing was happening. So I unplugged it, waited 5 seconds then plugged it back in. No problems so far.
So the problem still exists, after more 30-45 days it needs a "hard" reset...