Hi, I noticed, that my SP3 looses some percent of battery when it is under heavy load although it's connected to power all the time, examply some time of gaming. I start at 'Charged (100%)' and when I return to the desktop after maybe one hour, the battery-symbol says 'Charging (95%)'. Is there anyone else with that problem? Is the power-adapter too weak or may the problem be the surface itself? I have the i7-version.