Q: A few weeks ago I updated my iphone 5c to IOS8.3. Lately, when I'm using my phone, it will randomly shut off and I have to reopen and enter code, then 5 seconds later, it shuts off again.  Recently my top right button quit working where I can't turn

A few weeks ago I updated my iphone 5c to IOS8.3. Lately, when I'm using my phone, it will randomly shut off and I have to reopen and enter code, then 5 seconds later, it shuts off again.  Recently my top right button quit working where I can't turn off the phone when I'm done...and i can't take a screenshot or do a hard reset.  Since I can't turn the phone off when I want, the screen stays lit forever until it finally turns off. Right now, my phone is flickering on, then off, then on, then to the slide to power off screen. So I slid it to power off. It comes back on with the apple and then goes back to its crazy malfunctioning self. Is anyone having this problem too? It's driving me crazy! Help!