SB i7/256/8 slight bulge on the back of tablet from heat?

[tubedood]

I also have this same bulge... nice to see what is the inner cause! I feel that bulge on the casing does make it look cheaply made and for what we paid I think this shouldn't be acceptable. The lighting reflecting off the back of my display looks like varying hues of silver, some glossier than others due to the bulge. I would have gladly had a display casing that a hair thicker to help conceal all the parts that MS was hoping to hide behind this very thin magnesium shell.