Hi,
Yesterday my watch has been updated to ver. 5.20 and today I made a small training.
And I noticed that the stability of the current pace value became definitely worst than before. Now it is rapidly changing +/- 30 sec/km or even more while I'm running in a constant pace. I was running in a good weather conditions and on the open area.
The current pace value was never perfect, but now it is completely unreliable. Fortunately the average pace is still OK and the accuracy of the track is also quite good.
Do you have the same?