Four days ago my Forerunner 255 did a firmware update. Since then I noticed a sudden drop (from one day to another) in the race predictor of about 1 minutes faster each 5k (-1' in 5k, -2' in 10k, -4' in HM, so on). At the same time, the paces for easy runs in my daily suggested workout (DWS) changed to be 15"/km slower than usual. All those values have been almost constant (very slightly improving) in the last 3 months so the change is not really expected. My VO2max trend is not affected by this sudden change. Do you have explanation for that?
