Flying today, after an almost 3hr flight, on descent, selected direct to next waypoint, simulating ATC giving track shortening, aircraft started to roll right, not left turn. FD was showing turn left, hit heading mode on autopilot, still rolling right, disconnected autopilot, rolling left with control column (CH Pro yoke), still rolling right and descending rapidly, pulled power back, gear warning blaring, over speed warning, screen went red, crashed in from 13000'.
WTF happened?