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Garmin Connect 4.71.1 with Fenix 6x Pro Solar 26.00 - Sleep missing multiple hours in middle of sleep

Lately not sure if this is my Fenix or the Connect app, but it seems since the latest update (which I have been happy with) within the app - sleep movements etc. There has been weird reporting. As an example last night I felt I got a great nights sleep - and my smart ring showed a good night, but when I went to compare it to my watch data - I am missing a chunk of data.

0 trux over 1 year ago

Several possible reasons. For example:

a loose wrist band
restricted blood flow, not allowing the HRM to read your HR
a crash of the watch (check the folder //GARMIN/Debug/ on the watch for crashlogs)
nightly firmware update
corrupted FIT file containing the HR and/or sleep data for the concerned period

Checking whether other all-day data is missing for that period may perhaps give some more clues.