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Heart Rate Zones wrongly calculated on Edge 1000 after upgrade to 15.40

I know at least of two more cases of this anomalous behaviour: after upgrading to 15.40, for those activities stored in your Garmin Edge history , the heart rates zones are wrongly calculated or even erratic. Have you experienced this ? 

  • Upgraded to 15.4 yesterday and now all Time in Zones (Heart Rate Zones and Power Zones ) are corrupted. I haven't done a ride since yesterday to see if the corruption extends to Activities in Garmin Connect.

  • New rides done with 15.4 have correct Time in Zones data and graphics. Neither Garmin Connect activities are affected...just 15.3 activities data (Time in Zones to be more precise) are wrongly displayed with 15.4 update. Garmin has said nothing on this.