Laste Week I Bought a MI box. I was only reading good stuff about the device, so I Jumped in. First, Netflix doesn,t work. The infamous tvq pm 100 5.2.5 comes to play. I've read a lot about it, and I'm not really sure if it's a TV problem, a Netflix Problem or a MI BOx problem. There is no solution, that's all I know. Casting Netflix is also impossible, or HBO. None of the two platforms seem to recognize the mi box as a Chromecast Device. And so, two of the main purposes I Bought the box are gone. I have to say that everything else works fine. Kodi, DS Video, Casting Spotify (I know there is an official app, just was testing the chromecast issues). This isn't a post critiquing the Mi Box, I think is a very good device. I´m just feeling silly, thas all
Your two issues are most likely not Mi Box related yet you already blamed the Mi Box for both.
This is why the Mi Box gets their bad name. Everyone blames the box when the real issue is with the persons WiFi or the HDMI cable or the TV.