iPhone 5s touchscreen problem

in iPhone
My iP5s touchscreen not working properly. Sometimes it works normally but mostly it always random touch and even moved without being touch. But if i locked and unlocked the phone, it can be use normally for a while but then back to error again.

Any suggestions to fix it? I already tried to hard reset the phone, not helping. I also tried to reset to factory setting using iTunes, not helping either. 

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