About 30-50% of the time an incoming call brings up the normal of unlocking the display instead of the caller is predictable to unlock the display. After sliding to unlock, I am greeted by a black screen showing simply the notification bar. Not any of the button work, together with the power switch - the phone will be blocked until the caller hangs up or goes to voicemail. The missed call is not in my call log (which approach I have no thought who was demanding to contact me). Please help me to solve this issue thank you.
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