Admittedly, I use a Suunto Vertical, but I can see that the problems associated with swimming are common. A while ago I commented on another post on the topic, link here: https://forum.suunto.com/post/164078
I wrote there, among other things, that swim monitoring is the absolute weakest point in Suunto watches. This is my personal experience, but reading others, I have no doubt that I share the opinion of other swimming users. Almost everything works badly here, and the most important: counting the swum lengths of the pool, recognizing styles, completely ignoring other exercises in the water. So there is no point in complaining, because there are only two ways out in such a situation. Hope that Suunto will finally do something about it, or buy a watch that better monitors swimmers’ workouts. I write this with all new Suunto watch users in mind, because I remember my own frustration about two years ago.