Help playing music issues

[k1410]

When I play music and the sg4 stays idle for 20 seconds it standbys so the screen turns off,
here the music player starts to slow down and laggs..

This is a new issue that started yesterday and still occurs which is annoying

I closed all apps and cleared the memory but same problem

Also, the other issue is playing music in my car with the bluetooth,

There used to be no problem but now it doesnt play smoothly as if its buffering.

anybody who can help or has the same problem

thanks