Z Play apps stop unless they are on screen

[Demon27]

Bought this phone new from Best Buy. Ever since I've had it apps will randomly stop running unless I currently have them open on my screen. Messaging and maps mostly. I've tried different messaging apps and it's the same with all of them. I usually receive a bunch of messages whenever I open my app but I hardly receive them on time. If I'm using maps navigation and switch to another app on screen, the navigation will stop after 30 seconds or so. I've gone through every phone and app setting that I can think of. Also wiped cache (dalvik included) and I'm getting the same results. Any ideas?