Having the same issue with Chromecast becoming unavailable. Using a Samsung S-9 with Android 10, and One UI version 2.Using a licensed Kapersky Security Cloud version 1.34.0.20 which was last updated September 14, 2020. Lost availability to cast to all Chromecast devices (Ultra, & 2nd Gen Chromecast) as well as Google Home Displays. Getting ready to uninstall Security Cloud temporarily so I can watch the news. Might re-install later.