Hi everyone, my girlfriend and I watched a 4K copy of 'Ralph breaks the internet' which worked perfectly. After watching the movie, our television (Sony Bravia A8F) asked for an update of Android TV.

Afterwards the TV worked a bit funky (wouldn't turn on at first and would display a television channel in the corners while using the usb with the 4K movies). After turning it off and on again and removing the usb once more, it works.

Strangely enough, some of the 4K movies have stuttering sound (including 'Ralph breaks the internet') and would not add any subtitles (which were there before, because we always use English subtitles. Now, if there is a subtitle it is always English or nothing). When a subtitle does appear it is always within a black box (so white on black). Before it used to be just white subtitles on the movie itself.

Does anyone have an idea?