If the screen is popping up, that condition might be trigerred by a swollen battery. My iPhone 5 also did that, after a while, it worsened so much that the scr

If the screen is popping up, that condition might be trigerred by a swollen battery. My iPhone 5 also did that, after a while, it worsened so much that the screen colors became affected. I took it to an apple store, paid the fee and had them replace the battery. IMHO a swollen battery is a huge risk, and apple should have replaced my phone without charge. Anyways, be careful and if the battery is swollen, it's time for yet another battery change :)