Glad to hear you got this working. I'm not using Home Assistant although I
am running NodeRed which does query my Chromecast for status. I disabled
this however with no joy.
Some more reading suggests that I am not alone and is an ongoing issue with
built-in Chromecast devices in both Sony and Philips TVs. Hopefully NowTV
will resolve in the near future but for now I'm going to revert to a
Thanks, this solved it for me, too. Coming back to try and work this out again as I recently changed my router, I hit the same issue and again was able to get around it by putting the Chromecast on a guest network.
Putting it back on the main network and then removing it from Hassio, letting Hassio discover it again but then just leaving it unconfigured and adding it to the ignore list seems to have solved it.
So for others encountering this problem, if you aren't using Hassio, at a guess there is something else on your network that is accessing the Chromecast that the NowTV app doesn't like (but every other app has no issue with, which loops us back to the NowTV app being at fault and the company not being bothered to investigate / fix it).