Check the screen & ensure it's clean & nothing is pressing the search capacitive button (looks like a magnifying glass) in the lower right-hand corner. It's also possible there's a problem with the button but I don't want to jump to that conclusion just yet.
Sony released quite a few of interesting devices in 2013. One … more
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?