How to keep downloads alive in background?

I have a annoying problem. It's so difficult to get a download to complete in the background. Chrome is hopeless and Firefox isn't much better. Switching to another app or just pressing the home button will almost always terminate the download.
Why is the memory management so aggressive? I am running PureNexus and EX kernel.

Any tips how to change memory settings or other ideas how to fix this would be highly appreciated!

Thanks.

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