I got the same messages in my log. Not sure if it’s related, but in my setup, my chromecast is powered by the USB port from my TV, which causes the Chromecast to poweroff when I turn off my TV. HASS does not know about that yet, causing a timeout, which results into these messages.
I see the same errors + warnings in my log about a Chromecast that’s plugged into the TV’s USB port. Makes sense that it turns on and off, but that ideally wouldn’t result in log spam. Don’t most people have their Chromecasts installed this way?