Can any one help. I have recently started to get this problem on s9 running pie. One I lock my phone if I try pressing power key the screen stayes black but I hear phone unlock ;-( or if I hard press home key to start up screen it dose same thing. Unless I lock phone then just touch the screen. Tgen it actual lights up and I can then unlock it ;-( iv tried all sort's to fix in with no luck ??