I was getting so frustrated with my MI Box (had it for around 3 years love it) because Netflix would keep giving me strange errors. I reset my Mibox and it would fix it for the day but the errors would pop up again. Frustrated, I reformatted my MI box thinking it would fix the issue. It did not. I went on Netflix support with my error and one of the solutions was to log out and log back in. The thing about my Netflix app was I never had to sign in, it had some kind of Google smart login and I could just click my email. I think that is what was causing errors! So anyways, I signed out and signed back in (manually not Google smart login) and no errors for a week so far!
2 MiBoxes and a Shield, no problem with Netflix on either, use it almost daily.