My 645 (non-music) froze on the first run after the update to 3.30. See attached error-log.
I was using the back to starting point function (straight line) while this happened. The watch never froze before,
Welp, like OP, I got my first blue triangle of death today courtesy of 3.3. Non-music 645. I saved the run, it gave me my stats, and then BOOM. Blue triangle. Watch came back up ok, and the run saved ok, but come on Garmin. Attached is the error log.
Hello Garmin.
Is there a problem with HRM-Run software 6.60 ?!
I just bought a Forerunner 645 (no music).
I updated it to 3.30.
Yesterday I did my first run with it and my HRM-Run chest belt. HRM-Run had older software version.
Everything in statistics like daily heart rate and stress looked ok. HR data in run activity was ok.
Then yesterday evening the HRM received a software update to 6.60.
Today I did a run and a biking activity.
Both times the heart rate data in daily statistics is missing, there's just a blank gap as if no HR data was recorded.
HR data in activities are ok though.