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Translation:
The device powers off by itself. This problem appeared after it fell on the floor. When I hit it with my hand it starts.
يتم فصل الجهاز باور لوحده دون التدخل بعد وقوع الهاتف علي الارض تم ظهور هذه المشكله في كل شويه يفصل مني باور اخبط عليه بايدي يشتغل .
I used Google Translate to find the meaning of your message. Kindly post your future questions/feedbacks in English so we can assist you, this is an English based forum.
Looks like your device's hardware was damaged by the fall. You should contact your Local support (or a 3rd party repair shop) and get your phone inspected by a professional.