Surface Book 2 observation

[hardy1076]

I eagerly awaited my Surface Book 2 . I got it this week and everything is as expected.... refined, fast, love at first sight. But to my surprise after a few hours of use at night I noticed 2 things ... when I listen carefully to the charging port and the windows logo on the back of the display I hear a faint hissing/static noise. I then ordered a second one as a replacement ... to my surprise this unit is showing the same symptoms. I am just curious if you had noticed anything similar during your review. The model I ordered was the 13" Quad Core with 16GB ram.