When I was using 2.4GHz band, I have set the router to "Auto" channel
mode. It worked without any problem.Currently, I could set-up the dongle
to 5GHz by setting the channel to 36.For me, as of now, the problem is
solved (for 5GHz band)
Just to share... I have set the channel to 36 and the chromecast dongle
is able to detect 5GHz SSID and could connect to 5GHz band. Currently,
my dongle is on 5GHz and there is no problem in seeing FHD at 60Hz
I have firmware version 1.56.275994. It was working fine till last 1 or
2 months with 5 GHz band. One fine day, it stopped working and was not
detecting the 5GHz RF SSIDs. I have tried manually entering the 5GHz
SSID, but the dongle refuse to connect...