Why is my tablet keep restarting

here's a link to a forum page with the same issue.

if not helpful just type "random reboot galaxy 12.2" into Google or Yahoo seach, you'll have a tonne of fixes to choose from, all resulting in either version rollback or installing a different root or unrooting

hope this link will be helpful to y'all:

http://www.androidauthority.com/communit...

p.s:

this forum can be very helpful with other issues as well.