Problems playing music stored on sdcard

Hi, is anyone else experiencing issues with playing music stored on their sdcard? The music plays for several minutes and then will just pause for no apparent reason. No sign that the card has been unmounted or anything like that, could it be a problem with the card itself perhaps although I've copied lots of music to and from it with no problems?

Thanks

How to get the app name of currently music playing ?

I want to get the app name or pid of the running music player, how can I get it in andoird ?
Does android has an interface or something method ?

Thanks

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?