(Just registered to post here)
I bought my STR-DN1080 early 2018, and noticed a similar issue late last year. I expect it had be sucking 60W permanently for a 18 months by that point, so already costing me some £100 in wasted electricity!
I have a Sony TV too and I know that did all manner of tricks to pass the EU 1.5W directive, constantly disconnecting from the network and reconnecting once per 5mins, and gives a warning if you connect an amp to it that standby power usage will increase, so thought maybe they intended similar in the amp but failed.
I did do one complete master reset and got it back to 1W draw in standby, but as soon as I use any of the network services it permanently switches to drawing 30W in standby, 60W when 'on'. (So better than before the master reset, but not as good).
@mirrormurr do you have yours connected to the network via wired erthernet or Wifi? I did read some people find the wifi connection is lower power (BUT it disables all Chromecast / remote streaming function when in standby). I've not been able to recreate that though.
(Also, many thanks for sharing your encounter with attempting to get it addressed)
> Now I am actually wondering if this device actually should be allowed sold on a European market, as it must be in violation of all kinds of EU-regulations.
I definitely agree. There's numerous independent reports of this on different forums now. I also think What HiFi should strike it from the best-buy list, and moreover start measuring standby power consumption as a matter of course as the network AV receivers are increasingly going to be "always on" devices and the sum of wasted energy across all the devices sold doesn't bear thinking about.
