Music playback stops when the phone sleeps I got a new Sony Xperia V (LT25i). When listening to music on the phone it stops playing music as soon as the phone goes into sleep. I have tried both Walkman player and 3 and both give the same problem. 

Clarifications:


I play from SD card and internal storage.
It is a new phone, there is no app killers running that I know of.
If you're streaming music via your WiFi connection, you might wish to check your WiFi settings, and there go to "Advanced settings". Here is defined how WiFi should behave when the phone goes to "standby". The default usually is to disable WiFi, so you might want to set it to be kept alive:

 
WiFi advanced settings and sleep policy

While screens might look a little different depending on the device being used, these screenshots should help you identifying the settings :)