I went from a 3 series to 4 series 2 weeks ago. My HRV baseline was 46, and I consistently had scores in the mid-40s. No change in training, no alcohol,feel fine, but before I got the new watch my HRV went down into the lower 30s, jumped around but nothing above 40. Got the new watch, same low scores until 2 days ago when it jumped to 52, then 53, and last night back down to 40.
It just seems too erratic to be useful information. Anybody else experienced this?