Android Chromecast app connects to TV. Android screen displayed on TV. After about 30 seconds, message on Android says "Casting screen to Chromecastxx (the name of the device attached to the TV) has ended". A few more seconds and then TV screen displays "Cast connection stopped. Chromecastxx seems to have lost connection with your device. Please try casting again".
About a month ago, this same casting was working perfectly. Haven't made any changes since then. Have already tried rebooting the Chromecast device, checked for latest version number.