Galaxy S4 download stops when screen is off I'm having this problem with my Samsung Galaxy S4.

When ever I download something from the Internet and turn off the screen the download fails as soon as I turn it back on.

I have tried other browsers like Chrome and Dolphin Browser but all stops downloading when the screen turns off/ times out.

It downloads perfectly when the screen is on all throughout the download.  

This is a bit of a problem when downloading something big. I am using only 3G.
Because you have enabled the
Restrict Background Data

Under Settings>Data Usage>[menu]>Restrict back. Data

Uncheck that option

As, that option stops all background (when screen is off/slept) data transfer. Making every apps or system apps unable to do data transfers using internet.