Had the same problem. It all started when I plugged lan cable directly to Chromecast (from my router). Before that, my Chromecast and controller were both connected via WiFi to a private connection ...
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Had the same problem. It all started when I plugged lan cable directly to Chromecast (from my router). Before that, my Chromecast and controller were both connected via WiFi to a private connection from my Google WiFi ( different name provided by the router). Now, instead of plugging Chromecast to my router I plugged it to Google WiFi, the controller is still with Google WiFi, and everything is working fine.