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Vivoactive 3 wildly inaccurate swimming.

Hi, 

Just bought my wife a Vivoactive 3 for a swimming challenge she did. Her first swim (25 metre pool) was out by only 2 lengths with what she counted. She went again a few days later and swam 120 lengths but it only showed as 80 lengths, around 1000 metre less than she swam. I doubled checked she had correct pool size etc. The only difference was that I changed her data fields to show lengths. She set an alert to go off at 100 lengths but it didn't go until 17. She stopped only a twice for a quick sip of water and didn't change stroke or anything. 

Anything we can try to make it more accurate? This was bought for swimming mostly and to alleviate the need for her to count but she now doesn't trust it. 

I might give her my Fenix to try on her other wrist so she can see if there is a difference.

Thanks