Is it really cold where you are flying? Mine is really sensitive to temperature, if it is below about 45 F it really will nod, it's the material that the o-rings are made of. On really cold days I can even notice it warming up and cooling down at various altitudes in my apartment...It'll nod in the cold layers and stop nodding in the warmer air near the heater.


I'd try some softer o-rings before I threw it on the fire...