Sometimes it's not even sleeping it, it's un-sleeping too. Or even navigating between applications.
When this happens I go in to my messages to type a text and all contacts' names disappear and only numbers show up. If I attempt to click on a text the text will not show up and the screen is just black. It will either take more than 3 minutes for the text to load, or it will not load at all. So I have to shut it down in order for it to work properly again.
My phone has not been rooted, I have not downloaded very many applications, maybe just 5. I haven't even used it to browse because I'm afraid I would have to turn it off and just reboot the whole thing. Does anyone have an idea what is wrong?