S4 i9500 self shutdown issues

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http://forum.xda-developers.com – Hey guys , I've already searched the boards for this and there were a few people posting about this issue aswell but they've stopped posting for about a week now... I am having an i9500 (octa core version) and running United Arab Emirates 2013 June 4.2.2 I9500XXUBMEA I9500OJVBMEA firmware (stock , no root) , frequently when the phone is locked it will shut down on it's own and I have to keep the power button held a bit longer than usual for it to start (like 20 seconds) , I do not want to root it because the company I bought it from is not that...good....so I am very afraid of sending i (HowTos)