samsung galaxy mega 2 (SM-G750A) USED KING ROOT TO ROOT DEVICE & KINGO ROOT

I HAVE A PROBLEM... i ROOTED MY GALAXY MEGA 2 WITH KING ROOT... I USED ROOT CHECKER AND IT WASNT ROOTED PROPERLY. I TURNED AROUND AND USED KINGO ROOT BY ACCIDENT THINKING IT WAS "KING ROOT".. MY PHONE BLACKED OUT... IT WOULD TURN ON FOR LIKE 2-3 MINUTES THEN SHUT OFF.. AFTER ABOUT A DAY I TURNED PHONE ON AND CLICKED ON KINGROOT ICON AND CLICKED ROOT AND THE PROBLEM WAS GONE... i DONT WANNA TURN MY PHONE OFF BECAUSE I DONT KNOW WHATS REALLY WRONG IF ANYTHING WITH MY PHONE NOW.... ANY CLARITY ON THIS.. ???