S6 restarting randomly

Been looking around for a while now trying to figure out what the problem is. I have the EE variant of the G920F galaxy s6 in the UK. At least once a day the phone will reboot for no apparent reason what so ever. This has been since the 5.1.1 update, I have factory reset and cleared cache and it still happens. Anyone got any ideas? Thinking of flashing the international software to see if it happens with that.



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