That sounds like a large security flaw on the BT hub.
My chromecasts have worked for 6 months or so with no resetting, reconnecting, etc. The main annoyance is what they do and don't support. BBC app seems a bit flaky in that the cast option doesn't always appear, Plex doesn't seem to update what's currently playing and doesn't let you pause, etc. Google Music and local cast work fine.
That sounds like a large security flaw on the BT hub.
My chromecasts have worked for 6 months or so with no resetting, reconnecting, etc. The main annoyance is what they do and don't support. BBC app seems a bit flaky in that the cast option doesn't always appear, Plex doesn't seem to update what's currently playing and doesn't let you pause, etc. Google Music and local cast work fine.