I never had Aspen fail on me, but I found that it goes into the big red X at a drop of a hat. Like, if I step on the rudder a bit too hard. The most irritating part is, the device has no partial mode of any kind - it's all or nothing. Why don't you continue indicating altitude and airspeed if your gyros are unsettled? I am flying VFR, I don't care for the horizon line, but I need my airspeed! Idiots! If Garmin does not have this failure mode, it's infinitely superior to Aspen and is well worth the premium (if you can afford it at all).