Hi I received my s4 today but as soon as you stop using it the phone just reboots, if I use it its fine but as soon as I put it down within 30 seconds the screen goes black and it reboots. Is it a setting I'm missing or a faulty phone, sorry for the noob question but I'm along time apple user thanks for any help. I've tried to reset it through settings and a hard reset but its still the same, I can use it for hours with no problem but as soon as you stop using it it just goes Into a boot loop.