I have this problem also - constantly! I have a Samsung Galaxy S4 Mini (Android 4.4.2). It started happening immediately after the recent update. There is no question that the update caused it. I haven't installed any new apps in months. For the most part, it only happens when the phone is in portrait mode, so I can still rotate my phone to finish what I was doing. However, it has happened to me in landscape mode once as well, which left me with two frozen boxes on my screen. I should mention that it's also difficult to power off when this happens because the screen that asks if you're sure is underneath the frozen part of the screen. I initially turned off Google voice typing, but I use it all the time. After reading this forum, I uninstalled the updates for the Google Text-to-Speech, so we'll see how it goes.