Dear support, got a  CTD after about 45 mins of flight, preparing for descent: VNAV profile was prepared earlier, 4 mins to go. CTD happened while changing the Altitude (Turning the "ALT SEL" knob) to the lower level according the STAR and VNAV profile. VRAM: 5.7GB (8GB avail), GPU 47%, CPU 33%, RAM: 7GB (16GB avail) Log.txt