Hey there Tarshybear23,
I'm sorry to hear that your Chromecast is having some connection issues! I know networking problems can be tricky, so I'd be happy to help you out. First, I would recommend that you try the troubleshooting steps listed in this article.
Let me know if the error persists, or you run into any more issues while troubleshooting. I look forward to your response, and if you have any other questions or concerns for me, please let me know!