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235 missing a lot of distance

hi, i bought my foreunner 235 last year and it start to miss distance since may/june 

I mostley run with my friend that have the foreunner 935 and when we compare the distance it show him about 10% more each running

Here a running from today that the watch miss out 400 meters (look at the laps, I press on it when my friend watch beep)

https://connect.garmin.com/modern/activity/5571395705?share_unique_id=4

Any solution for this?