My phone screen has been unresponsive all day. It started out being unresponsive for a minute or so, not so often. But now, I can't even log into my phone. When I try to put my password for my lock screen, it's as if I'm not even touching it. It won't respond to anything. The side button work totally fine as I have tried to hold the standby button to try to restart my phone. But I can't even tap that. I don't know what happened. I've tried pulling my battery out and then turning it back on after putting the batter back in. I've tried doing that without a SIM card. But nothing seems to work!