This absolutely annoys me. Both my 920 and SurfaceRT do not have an option to prevent screen timeout/lock. So if Im sitting at home streaming music from my phone to my BT headset, 5 minutes in my wifi gets cut and Im switched over to my data plan. The other day im watching a cooking instructional video (youtube) on my SurfaceRT, every stinking few minutes i have to wash my hands, dry them and then swipe to lift the screen lock. This last scenario is the most recent and absolutely infuriated me.