I am having an issue where when I start up gamestream on my shield tv the computer resolution keeps going to 720P. I am on ethernet and have set it to 1080p 60 under game stream settings(my shield is connected to a 1080p projector) for my PC that is attached to my account. I think the problem is on my PC I have a 2560x1440 display at 144HZ and then it keeps pushing my display into 720P every time I launch a game from game stream. I tried setting my computer resolution to 1920x1080 60HZ with no luck either. To make matters more complicated I have two monitors at the same resolution but at different timings connected to the PC. Any help would be appreciated!
Edit: Figured it out! If you have any VM software installed it messes up networking and places you in the roaming profile (which is separate from wireless or Ethernet). If you disable the virtual network adapters on your PC everything works as normal. Thanks for all the suggestions!
Have you created a custom resolution in Nvidia Control panel for the target resolution/framerate desired (not setting your computer to target resolution - don't do that - just create the custom resolution)? I had to do that when I had a 16:10 monitor but wanted to Gamestream at 1080p (16:9).