I bought the SP4 since it was fanless. To me fanless with SSD would imply totally silent. In the past week, I've noticed an electrical / squealing noise that seems like it is coming from the lower right corner of the SP4. No change if I unplug the Type4 keyboard.... Can anyone else hold theirs to their ear to see if they hear a similar noise? I am nearing the end of my 30 day return period. I'd feel embarassed returning if it was a normal; but I'd feel stupid for not returning if it is the sign of a bigger issue.. Display or power shielding issue?