Any time my 1520 screen turn off, it cannot turn back on. I can see the glance being shown, where it show the time and day, but double tapping or pressing power button still will not turn the screen on. I did a hard reset, and it improve the phone it was a little smoother but I still have the problem of the screen not turning on. The only way that I was able to turn it on is by holding the power button down for a while and the phone would restart.