Default [Q] notepro 12.2 screen turning off by itself

I recently picked up a notepro 12.2 lte variant. But recently its screen keep turning off by itself. I am sure its not screen timeout bcuz I set it to 30 mins and I am watching a video on youtube when it turns off. Anyone got any idea what's causing this? Should I send it for repair? It haven't been a week, if I have to send it for repair its pathetic