Hi,
I have been using 255s with the firmware number 20.29.
For 2 weeks, I have been doing pool workouts, swimming almost 1.2-1.3km for 1 hour however the watch only gets 400-500meters for 10-20 minute in total.
It can not determine the laps in each time, continue counting the resting time. The setting of the pool lenght etc is correct. Can you please fix the issue.