Best Answer tgessendorfer , 03 April 2017 - 11:30 AM
I think it's the Wifi router (AVM Fritz! Box 6490) which I am using... Nvidia Shield TV has 1GbE and the Mi Box 3 4K has Wifi on 5Ghz (sitting next to the router however).
There seems to be an issue with the 5Ghz Wifi (no real usage in my environment as I am using LAN cables wherever I can).
I have now switched from 5Ghz Wifi to 2.4Ghz Wifi on the same router and it works!!! Would never have thought something like this can happen. Probabyl need to raise a ticket with AVM for the router and/or Xiaomi for the Mi Box assuming it's the box having issues as all other local Wifi devices on the 5Ghz network are just fine....
Arghhh.... cost me 10 hrs of testing and hopefully fine now when staying on 2.4 WifiGo to the full post