I reviewed my alert volume levels and realized I have two alert volumes from the Garmin stuff; one from the G3X and one from the GNX375. Curious if they are one alert going though two different boxes to the audio panel? That would explain why they are slightly different times? maybe if i turn off alktitude alerts on the G3x, but keep them on the GNX375, I will go back to only one????
I have seen similar things before when upgrading the G3X software: previous custom settings get set to default and things need to be re enabled.