HDMI-CEC control on TV, you can google, and you will get more idea in shart :
CEC (Consumer Electronics Control) allows for HDMI devices to be controlled with one remote control. If you try to cast to a CEC supported TV while on a different source input (local TV channel, Cable, USB), source input will automatically switch to the HDMI port where the Chromecast is connected.
Hi all this looks like 3.1.6.Xxx is a major change in firmware, so if possible do a factory rest and configure your otts again.
I was getting a flicker of light some time so did factory reset, Issue got resolved.
Even after factory reset the latest version firmware retained by box , that means they made this new release as a factory default image. Off course the application software we need to update to new.