Strava API Changes
On 18 May Strava decided to no longer offer best effort data via its API to free members. You can read more about it here.
If you're a Strava subscriber, you won't be affected by this change. After June 18, if you're a Strava free member your personal bests will be calculated on PB Viewer. This means that it may take longer to process your activities and you might see some small discrepencies between your personal bests on Strava and your personal bests here.