ARC not recognised

[Scabutz]

I have a Samsung Series 8 TV and I've just bought a Denon X1600H.

I've plugged Sky Q via HDMI to the AV amp, then HDMI to the ARC port on the TV.

But it's not recognising ARC. If I try to select sound output on the TV to HDMI it selects it, then goes back to tv speaker and then option disappears.

As far as I can tell ARC is enabled on the TV and amp.

Any ideas?

[Scabutz]

No I havent. Will give that a go and see.

[Scabutz]

Yes its definitely in the ARC port and the HDMI cable is a Sandstrom Gold high speed with Ethernet.

Anyway I unplugged the TV and plugged in again and that's fixed it. Works fine now.