08-14-2018 02:48 AM
Which video player application are you using?
Your phone is updated to the latest version? (you can check it: Settings > About phone > Build number, the latest one is P2a42_S251_171107_ROW).
08-15-2018 07:38 AM
Sorry, I dont know which application used to play videos by default, I dont see dedicated video player (it uses Photos or Google Play Movies maybe).
I'm using VLC player since years on my phones, can you try it?