IPhone 4s switches itself off and on! Advice?

Hallo folks. My iPhone 4s switches itself off and on. It takes seconds for it switch itself on again. I've tried to read so many threads. Told it might be the LCD or the charging port. I begun changing the charging port. No solution! Today I changed the LCD. No solution again. What could be the problem? What shall I do next? I even reset it to the factory setting. Still no solution. Any advice will be well appreciated.

Have you told Apple? The Apple store specialists can assist you. It has nothing to do with your LCD.

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