Yup I still have issues with mine. I'm on my second box and I still have this issue. I've been in contact with Xiamoi support and tried resets and other things and nothing worked. They told me to return it. I've been hesitant because I'm worried I'll still have this issue.
I have those issues when watching Netflix over wifi. I found an old USB to Ethernet dongle for the wii in a drawer and decided to try that with my mibox. 0 problems playing anything on Netflix over Ethernet. Has to be something with the wifi and Netflix.
I've never had problems...
Experiencing similar issues. The ultra HD titles will play for a few seconds and then the screen says it is not available. This happens when the settings on the Mi Box are at both 4k or in 1080p. The normal HD titles seem to play fine.