This happened a few times yesterday and once today but my phone has turned off by itself. Today I got a text and I opened the conversation and decided to reply so I opened the keyboard and bam, phone is off. I have to take the battery out in order to start the phone. I was texting a lot yesterday but I can't say if that was when it would turn off. I uninstalled a few apps to see if that could be a problem but the ones I've uninstalled haven't helped. Anyone else having this problem or heard of it?