hi everyone im thinking of getting thiss tablet thiss weekend, just beet to a pc world to look at it, was watching a youtube video on it , after about 30 seconds in screen went dark, as if in standby mode video still playing ect whem i touched the screen went bright again, do you have to keep youching screen wen videos playing ect, to stop thiss , irealy want to put video on and sit back and watch ect, .....