Exaggerated estimated moving time
Suddenly the estimated moving times on my saved routes are grossly exaggerated. For example, Strava estimates that a 112 km ride will take c.32,368 hrs! A 63 km route will take 18,296 hrs! And so on. Dividing each route's estimates thus: Distance by Time shows Strava is factoring speeds in the range of 290–295 hours per kilometre. Time/Distance = c.0.00346 kmh.
So far as I know I haven't changed any Strava settings.
What's going on? How do I fix it?
(BTW, I think this has happened before but I can't remember if I did something to fix it, or it fixed itself.)