I'm sure that this is not the problem with your glitches---At least reasonably sure---Since when has it become customary to just velcro an RX to a plate in the plane without protective foam---As an electronics tech, if you knew how sensitive a crystal can be when under vibration, we all would take better care of our receivers....In a turbine jet this is acceptable as there is no vibration, but in a big gasser--No way!!!...

Kevin