Screen goes black when I play videos

When I play a video, it starts off as a black screen and won't wake up until I touch it. Then after a while, when the bar with the pause, fast forward, rewind etc buttons disappears, the screen goes black again. I can still hear the audio playing. This only happens with videos I have filmed on the device (either saved off snapchat or the in built camera app) and still occurs on other video playing apps. Is there any way to fix this?

A couple of Z5 videos...

Found 'em on Youtube. First is a guy holding the Z5 while riding a bike (LOL). Second one is a comparison of videos taken with the Z3c and the Z5c. Can't wait to see more action vids.
:victory:

https://www.youtube.com/watch?v=vhSlns7M-Gg
https://www.youtube.com/watch?v=KkO_eS_EAhw

Orzly Cases for the Sony Xperia Z5 [with videos]

Hi all,

This phone is available here in the UK but to my surprise, there's not much in the way of accessories. Don't get me wrong, there are products on Amazon but nothing in the way of YouTube videos to see if the cut outs are correct around the case.
In my search I came across these cases from Orzly. It's their signature cases they bring out for most flagship handsets but thought it would be useful to share with the XDA community as I'm sure there's people looking for cases.
Orzly FlexiSlim Case….

Brightness is too high when playing videos after Marshmallow update.

When I try and view movies or TV in he Movies & TV app the brightness is too high. It changes from normal brightness to very high while the video is loading to play.

Anyone else having this problem?