N4 Butt Dialing Troubles

Is anyone else having issues with their Nexus 4 screens not turning off when they press the wake/lock button. Seems like almost daily that I pull my phone out of my pocket to discover that it was wide awake the whole time. This weekend, I drove for an hour and a half with the thing on. The whole time I was wondering why my left pocket was so damn hot. And my phone just butt dialed a friend of mine who was in a lecture since the screen didn't actually turn off when I expected it to.

I have a bumper on the device if it's relevant. Is anyone else experiencing this?