Mine done that once when it was less than a week old and I done another soft reset, power button and volume down be sure to hold them in until phone vibrates. I almost gave up and it took several minutes before phone finally went into soft reset and vibrated. Any other time it does it in less than a minute, don't let up on the buttons until it vibrates, like I said I did not think it was going to reset but it finally did after several minutes.