J700h restart problem.

hello friends,
i have one J700H. problem is restart after one or two minits.

my procedure is :

1. i flash update 6.0.1 but not done.

2. flash with repair 4 files.

3. change firmware like BNG, IND KSA etc. no luck.

4. i downgrade masmallow 6.0.1 to lollipop 5.1.1 but not done

5. phone imei, baseband status ok, battery ok

i can't solve , need your help.

pls reply , how can i shoot this restarting problem.

thanks with best regards,
mahir