Why can't I Cast to my TV all of a sudden?
Check to make sure both devices (the TV and the Phone/Tablet/PC or other cast device) are on the same network. Your phone or tablet may be connected to your cellular data network. For cast to work, both devices must be on your home Wi Fi.
Why is my phone not casting to the TV?
If you're having trouble casting video using Chromecast built-in (formerly Google Cast) functionality to your Android TV, make sure you're using the current version of the Google Cast Receiver. For best results, make sure your Google Cast Receiver is updated to version 1.33 or higher.
How do I force Cast to my TV?
Why can't I cast to my TV from my Android phone?
How do I fix my TV Cast not working?
How do I cast my screen wirelessly?