Why doesnt my phone(Samsung Galaxy S4) start?!(Only like 2secs)

I need help guys!
My phone (Samsung Galaxy S4) wont boot up!
It doesnt give any reaction , no recovery mode or something like that
Sometimes I'm able to put the battery off and on again ,which causes that he boots up on his own for 2 seconds!
Sometimes its even able to boot it up with the power button for 2 seconds!
And 2 days ago ,it boot up on his own for even 1 -2 minute(s)!
And its not a boot loop!

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