AAIU-2016-AII-01. The purpose of the flight with the UAV (named Oculus B by the operator) was to fly a predetermined flight path within a Temporary Segregated Area (TSA) around the airfield of Weelde (EBWE) crossing some waypoints programmed in the autopilot as a test, before doing a flight taking a camera system on board. Immediately after take-off, the UAV reported communication problems to the ground control station. As a result, the ground station commanded the UAV to enter in a Hold mode to which it initially responded, starting to fly a holding pattern. After communication was lost, the aircraft left the holding pattern and initiated an automatic landing sequence, that failed. After several attempts, the aircraft flew away from the ground control station, in a southerly direction. The pilot immediately warned the ATC about the loss of controls. The UAV continued a steady flight at 4000ft until the engine stopped operating and the UAV crash landed in the North of France.