Several hours ago, my iPhone 5s, which I've owned for about 2.5 - 3 months began acting up. I was randomly shutting off & turning it's self back on around 5 minutes later. It then began freezing in the middle of texting, or browsing the web & doing the same thing, only taking longer to turn back on. While doing this, the home & lock/ power button are useless. What's the problem here? & what can I do to fix it?????