SL-30-Yes-I saw it!

Indicated a power failure on the comm side plug in the rear. Pushing it on firmly and tightening the screws eliminated it for me.
 
SL30 comm failure message

Yes, I also have seen this message on my SL30. The comm side had failed, in my case reseating did not solve anything. I had to send it to the dealer and he verified the problem and RMA'ed it to Garmin for warrenty repair.

good luck
 
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