Thank you all for your replies. Turns out the transponder is intermittant, and the problem cannot be reproduced on the ground. I just don't want to deal with a transponder that potentially dies on me when I am trying to cross the border twice over the next two weeks, or when I am making the trek to OSH, so I think I am going to bite the bullet and get a new unit (Garmin GTX 327). I have had problems with this transponder over the last couple of years, I think it is trying to tell me something.
Kevin
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