rsternap

Itman, Already suggested, don't forget to assign a static IP in your router

True, but I believe you can assign a static IP address in most routers these days

Try the help page here under 'problem accessing a device on your network' https://help.eset.com/ees/7/en-US/solving_problems_protocol_filtering.html adding the chromecast ip address to the exclude list worked for me. Find the address in google home app - tap the icon for your chromecast device, tap settings (gear symbol), scroll down to information