Something weird happened today. I swiped the screen to the left to access an app and the screen went black. As in the phone turned off. I knew for a fact the battery still had 50% charge. Holding the power button did not turn the phone on. I thought it fried on me. I held the power button for about 1 minute and suddenly it turned on. It booted fine and still showed 51% charge. Has this ever happened to anyone?