I did a Google search - did not see this come up. Was just sitting there watching a movie - look over to see S4 go through complete shut down - reboot. It has the latest update. The only new app & was in use in the back ground - The 'Timely' App set to go off every 1/2 hour. I just tried to find a log - I cannot. Looked all through settings. What should I maybe do - or just pass on it as no big deal. It works fine fully functional. I reworded the search in Google - found others similar - But most of them had repeated reboot only stoppable by pulling battery. I always shut down & pull battery after any update.