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My Garmin Forerunner 45 doesn't update pace.

I'm doing the Greg 5k plan with my Garmin Forerunner 45.  The problem is that, when I run faster, the watch doesn't update my real pace, but it shows the slower pace I was running, example: I'm running at 6:30 then I run faster, like 5:30, but it keeps showing 6:30 even after 10 minutes or more.  I'm running in a very large open park, so the GPS to satellites should track geolocate properly.  However, when I finish a KM, it flashes my real pace, but then returns to show the slower pace again.

Is there some setting I should correct?

Any help much appreciated