perhaps you could describe it a bit more concisely than you have done above
Or even precisely?
I don't see it as normal behaviour. I had HDMI CEC on for a while and did note that my TV switched channel if I connected my Chromecast, but only when connected to an HDMI port on the TV that had higher priority. Swapping the cables over might help? Or is this madness? Who knows?
What I do still get, though, is the TV blanking for maybe 5--10 seconds shortly after changing the Foxsat HDR to an HD channel. This doesn't happen when I change the TV to an HD channel, nor the HDR Fox T2 to an HD channel, nor the crummy Youview box to an HD channel, nor even when my Blu-Ray play sends HD content to the Amp and on to the TV, so I assume it is a Foxsat HDR fault?