Seems to happening with increasing frequency now. As soon as I ended my swim the screen went straight to the blue triangle screen. I've also had times in the past where it shows up in Garmin connect as a multisport event - with just a swim. Garmin Connect, Strava and TrainingPeaks don't recognise the file. Garmin support have not been helpful over email. Going to call tomorrow.
I cannot click into the activity data on the watch and the swim icon just has a dotted line icon instead of being filled in and blue.
Any one else experiencing this issue?