Okay so this started yesterday out of the blue. My phone was working fine and then suddenyly the screen became unresponsive. Mind you, everything on it still works - animations, notifications, calls, the whole bit. It's just I cannot interact with it at all. I restarted mutiple times and it works for a little, then stops. It's like it freezes but it's not the phone freezing, it's the input of the screen, my touch. The back buttons work, and are the only way to turn the phone screen on. However when I do this, the button seems to seize up and presses multiple times, which brings up the power menu. I am unrooted running Lollipop 5.0.1. I have factory reset, but I can't even access the phone anymore, as the screen still is unresponsive to my touch. Any help would be greatly appreciated, I am at a loss and am incredibly frustrated.