QANTASLink Boeing 717-231 VH-NXK operating QF1780 Brisbane – Mount Isa was around 45 minutes into the flight at 34,000 ft this morning when it turned back to Brisbane for a safe landing due to a technical issue. The flight and the return QF1782 were subsequently cancelled. The aircraft then operated QF1782 Brisbane – Mount Isa this evening, however at almost exactly the same position it again turned back to Brisbane for technical reasons.