Hi all, I have my surface almost a year now, and I am enjoying it so far. However, since about a month, my battery is acting weird. It drains very fast, it gets warm when I am hardly doing anything. Since this week, my surface will automatically shut down if my battery is at 20% left(cfr Batteryreport). I can't see my mWh either... Should I contact Microsoft? Or is this an OS problem?