Thanks for reaching out. Let's sort this out.
A few questions: what type of Chromecast device do you have? Is this only happening when connecting a Bluetooth device to your Chromecast?
Give these steps a try:
Note: Please be advised that connecting a Bluetooth device is only supported on Chromecast with Google TV devices (4K) and (HD).
Let me know how it goes.
Thanks for getting back to us. Could you please factory reset your Chromecast with Google TV (HD) and try to pair your Bluetooth device? Also, if one is available, try to plug in your Chromecast with Google TV (HD) to a different TV screen and test.
Also, please edit your reply and remove photos that are showing the serial number, MAC address and IP address. This is for security and privacy reasons.
All sorted, thx for your help. It was all good when I used another TV. So I’ve disabled the HDMI-CEC feature on the Chromecast HD. The TV & sound doesn’t go to sleep when I connect via Bluetooth now. But because I’ve disabled the HDMI-CEC it’s created issues with connectivity to my BOSE sound bar. Looks like I’ll just need to come up with a strategy in regards to how I use devices and the settings I use. Again thank you for your help.