I have had my Samsung Galaxy Watch since christmas and i use it every morning to do 30 lengths in a 25m pool, it has always been 100% accurate until 2 weeks ago.
Since the software update it is now completely inaccurate often saying i have done double or even triple the amount of lengths i have actually done. I have reset the watch and also checked that it is still set to 25m in the settings. My partner has the same watch so i borrowed hers this morning and still the same problem. I did 30 lengths but the watch said i did 90 in 30 minutes!
Can you report this to your software engineers to send a further update to fix this please.