I've had the Lumia 520 for just over a month or so now and have noticed (more frequently recently) that even though I have looked at my phone not long beforehand, my phone literally will not light up when I press the lock/unlock button. My phone never dies from low battery as I'm careful about that. In fact, it just did it while it was on charge and I had just turned off an alarm. I don't know what the hell is causing it but it's annoying as the only way I can get it back on is to take the battery out of the phone and put it back in again. I'm wondering if anyone else has had this issue and knows how to sort it out? Thanks!