When I view an activity - either mine or a followers - I can see a map displayed with the route. But if I click on the map in order to look at details, the map disappears. I am just left with a trace of the route, on a white background. 

I'm using the Strava app on an Android phone - Samsung S18.

This has been happening for approx 1 week. I have tried deleting and reinstalling app but problem persists. 

Any help please?