Ok so i bought this Phone. Use it for 2 3minutesand directly install preview for developers because my old 620 has it and it has just tiny bugs. It was running well on my Lumia 620 so after 2-3 minutes of using my new phone I direct ly put 8.1 on it. I updated and my version is 8.10.12397.895. Since I got the 8.1 update., my phone gets so ****in hot sometimes. I use"YouTube HD" for YouTube client and when I watch a simple video, my phone gets to hot that I can't touch it. Same problem happens when I play asphalt 8 and subway surf. Please help I hard reset my phone nothing changed. Also when it gets heated my battery drains very quickly. Friends please help