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Open water swim issue

Since few days ago, my 935 device won't measure accurately open water swim distance. It's basically an euphemism for won't measure at all. I swam today 2.5 km over 1 hour and measured distance was 3 m. Since two of my friends who own 935 also have the same issue for the last couple of weeks, I wanted to see if this is a common thing with 935. I don't recall any software updates that would be the root cause. Had an olympic distance triathlon race on Saturday and everything was fine then.