I don’t know why it failed but since I also have my Watch track my rides I’m merely irked & not vengeful.
45 miles with about 1500 feet of climbing felt very good. The legs never demurred.
I actually did 45 in 3 hours and 6 minutes or so. I avoided most hills but the wind was steady.
From my watch — which always gets the climbing feet wrong.
Some not actual sprinting at the airport too.
Ecbatan 