@hitimahana This was my answer from the team on the same question on the 9th of November:
We've recently been getting a large amount of users with the identical issue as yours, all with the Chromecast firmware version 1.28.100555, which is the newest firmware update for Google's Chromecast. Unfortunately Google doesn't provide a method to downgrade the firmware of your Chromecast. The firmware version we know to work is 1.27.96538.