Hey there Redmi3s,
I apologize about the late response, thank you for being patient! Were you able to fix that radio issue? If not, I'd be happy to help out, let me just ask you some questions about what's happening:
When did this issue start happening?
What type of Chromecast do you have?
What troubleshooting steps have you already tried?
I would also check out this article on common Chromecast connection issues, it contains some good steps to fix most connection issues.
I look forward to your response, and if you had any other questions or concerns for me, please let me know!