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Try running the phone in safe mode (press down on/off button > press and hold on 'turn off phone') to see if this might be caused by 3rd party apps.
my best advice is to clear cache in storage and restart the phone if that don't work repair via pc companion
Not necessarily a hardware issue. I suggest that you try to repair the phone software using PC Companion..
Before repairing your device you may want to backup your information first. Check out this topic for more information on how to.
How to backup?
If the issue should still remain I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.