I had the original Vivoactive, and on two occasions the 'lap' button stopped working. Both times I'm pretty sure it was a result of swimming, and Garmin sent me refurbished units twice. This doesn't sound like the same issue, but I wonder what's up???

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No, but nice to know I'm not alone. Looks like Garmin is sending me a replacement. Hoping it was a coincidence since I love the swim feature on my VAHR. Eventually I'd like to save up for a 935 or Fenix (whatever the top dog is once I'm out of the hole caused by my layoff last summer) but since I just started a new job I'd still like to get a year or two more out of my VAHR/910xt combo.

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I still lapped everyone on the couch!

The same thing happened to my wife’s Vivoactive. Garmin sent her a new one but advised against swimming with it. The issue stated by Garmin customer service was with the glue and Garmin engineers knew about the problem. She just uses my 910xt to swim now.

Been there; done that. I too, am up to 3 of this model. It is designed to be a swimming device, which is why the swim mode is included. Having said that, I was told that water creeps in while pressing the buttons. The good news is that Garmin has sent as many refurbished models as I needed to keep me going until I buy a new model...and I will soon.

The new models are almost big enough to live in though and wear me instead of me wearing them :-(

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DFL > DNF > DNS

Do any of you find the vivoactive hr over-tallies your laps when you swim? I have the feeling mine consistently overstates the distance I swim... inventing laps where there aren't any. Totally messes with the sTSS value for the workout (like makes it ridiculously high).