Hi, i was wondering if anyone noticed a bulge on the back of their tablet portion of the surface book. It almost feels like a distortion in the casing due to heat. If i used my hands and slid it across the lower area (below the windows logo) i can feel a slight bump. It seems to be permanent now, and I don't believe this was there before. Do i have a defective unit? or is this normal because of the heat? I also noticed my surface book can get up to 80~84 degrees (HWMonitor) while running on high performance mode and playing games. Is this normal? I got my surfacebook yesterday and i am quite sad about this. Thanks the help.