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Race Predictor suddenly dropping like a rock?

Has anyone experienced something like this? The predicted race time is dropping very rapidly for three days in a row even though I feel fine and am performing fine. It had been improving slowly but steadily for months and I have never missed a training session. My heart rate and pace are similar to the previous week - if anything, it is better (most recent pace is slightly faster with lower heart rate given the same distance).

0 6340692 over 2 years ago

Also, all the runs were done with the same software version. I only just updated to 12.23 after the above data was taken.

0 my40789 over 2 years ago

But does it become more accurate?

0 6340692 over 2 years ago

UPDATE: The result seems to have stabilized, but it still leaves unanswered why there was a sudden change. For reference, VO2-max shows a slow steady improvement throughout this time period (not enough to change the reported VO2-max number, but enough to show a clear and visible trend in the 4-week VO2-max graph on the watch).