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In a message dated 8/16/2008 3:06:02 A.M. Eastern Daylight Time,  
europa-list@matronics.com writes
Hi David,
Although I'm not familiar with your particular Garmin, I have a Garmin  250XL 
installed in my Europa. The 250XL has a provision to allow remote toggling  
of the active and standby COM channels. I would imagine yours does  too. I have
this feature wired to a button on my left stick. The input  requires a 
momentary ground from the switch on the stick grip to toggle the  channels. 
Early
on, my Garmin started doing what you describe, toggling  between active and 
standby channels. It seemed to have a mind of it's own.  Turned out that the 
switch in my Ray Allen stick grip had gone bad. It was  intermittently grounding
the toggle wire to the Garmin and was causing the  errant toggling of the COM 
channels. 
If you have your radio wired this way, that could be the culprit.
Good luck with this and your trip! 
Anyway, hope it helps! 
Regards,
John  Lawton
Whitwell, TN (TN89)
N245E -  Flying
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