Excellent watch, but the swimming metrics unsatisfactory!

I tested my watch with mountain biking, weight training and swimming. No complaints for the first two: the watch is easy to use, precise and delivers a lot of useful information.
For cons, the swimming metrics available from mid-November is again! Because in my 80 X 25 meter lengths, it gives good 2000 meter swim. But the watch was given to each session total lengths completely wrong, gender 500 meters or 750 meters. On one occasion, it has been only five minutes of swimming instead of one hour. Apparently, the team shows that the accelerometer does not detect when I come to the end of a length of 25 meters, which means that often it has two, three or four minutes long instead of 40-45 seconds ( backstroke).
The V800 well identifies the swimming type and correctly displays the heart rate, but that's it. Because of the bad registered length, the remaining data is not usable. I hope that the next update will fix these defects that have disappointed me a lot because I had chosen the V800 for its supposed ability to swim.