I’ve just changed from an HD-FOX T2 to a 2000T, when I switch my telly off my AV amp no longer switches off, it continues to play the sound from the 2000T. With the T2 switching the telly off also put the amp on standby.
I’ve checked the telly to ensure that the settings haven’t changed and likewise with the AV amp, the only thing that’s changed is the Humax box.
The same thing happens to me. Moving from a Fox T2 to the 2000T also caused me to lose ARC functionality between TV and AV amp and I had to buy an optical cable instead.