Thanks for posting here in the Google Nest Community.
This is not the experience that we wanted you to have, let me help you out. A few things: which Chromecast device are we working with? When did your issue begin? What is its distance from your Wi-Fi router?
You can do a sequential reboot. First, unplug your Chromecast for 30 seconds, then do the same thing to your Wi-Fi router to refresh both devices and your Wi-Fi signal. Plugging it in to another HDMI port might help.
Let me know how it goes.