I went for a ride today. While I was riding my Garmin shut off; so I turned it back on. When I returned home I plugged it in to my computer, and then loaded it in to the Garmin training center. My whole ride was there, except for a small gap (depicted by a short straight line) for the interval where the device had been shut off.
OK - here's the weird part!
This evening I uploaded to Garmin Connect; and I noticed the entire first lap was missing. I thought it was rather odd, so I went back to the Training Center to check it out, and the first lap was missing there too! I know with certainty it was there when I first uploaded. The device had been left plugged in to the computer all day, but I did not do anything with it, and there is no way I (for instance) deleted the lap from the device.
In hundreds of rides I have never seen this before...
Does anyone have a clue what might have happened?