On 25/02/13, a Boeing 737-838 aircraft, registered VH-VYE and operated by Qantas Airways Limited, was conducting a scheduled passenger service from Canberra Airport to Brisbane Airport, Queensland. At 2110 Eastern Daylight-saving Time, about 115NM (213 km) from Brisbane, and as the aircraft approached the descent point for Brisbane Airport, the aircraft's autopilot unexpectedly commenced climbing the aircraft. The crew disconnected the autopilot and descended the aircraft. During the descent to an air traffic control-cleared level the aircraft rolled left and deviated laterally from the flight plan track. The autopilot was subsequently re-engaged and the aircraft was manoeuvred to re-intercept the flight-planned track.