Just bought the 65 Hisense H9G and picture is very nice, but I'm stumped on two things. First, I can't put the tv into HDR Theater in the settings even when supposedly watching HDR content on prime and other sources. I have a 58 inch cheap 300 dollar tv that automatically detects HDR and displays it on the tv, but not this one. Secondly, I have a Roku 4k box connected and it won't recognize it. Just a black screen. Switch it to other tv and it works fine. Really aggravating for a somewhat expensive tv. Any help is greatly appreciated.