I'm paying the 4k subscription premium but on my POCO F3 device, netflix App breaks the widevine l1 certificate and it only suppory SD quality, that on the high resolution screen of this phone is terrible. By Restarting the phone the certificate come back but after having reinstalled the app it only works for something like 3 minutes in HD before showing a 500.-116 error, and stopping the video reproduction. Checking the certificate after the failure shows that is gone. Unbelievable.