Thanks Kezo. Followed that to the letter. TV audio input on the Yamaha defaults to AV3 – other options make no difference to anything.
Lets keep things simple for the time being!
The TV looks as if its recognising all the devices. Are you able to turn all devices on and off via the tv remote? If this is the case is there any slight delay in doing so?
How far away is your amp from the TV and have you got 5.1 setup?
Ideally we should concentrate on TV and amp which I should of said sorry. Try removing your firestick and blu-ray out the loop for now, although its unlikely to make any difference.
Have you tried using ARC on HDMI 4 on the TV?
Do you know what version of HDMI cables you are using? although version of 1.4 saw the introduction of ARC, HDMI 2 came out in 2015 and has the ability to transfer data faster. For the sake of a fiver or so depending on lengh I would get a certified 2.0b (2016) just to rule this out. (I use a company called Kenable who are online or Ebay). Think of it as a iphone charge cable, some work well and others not so well n all functons
https://www.kenable.co.uk/en/384-certified-hdmi-20-cables