Garmin Forerunner 735xt user here. I've noticed the past couple of days that the HRM Pro wil not send any heart rate data to my watch after open water swims. I didn't have this problem before, is it some software update issue? Battery level is good and latest software version is 7.1. It works fine for cycling and running.m7QVxkD. 213 10 305 13 263 353 73 47 467