Hi, 

an interesting glitch: I had saved a route to the app. At the start of the ride the app automatically started and announced the first turn, but instead of following the route, I made a circle around the parking lot returning to the start point. When we started out on the actual ride, the app failed to verbally announce the upcoming turn. I rode several miles with no announcements. I pulled over and closed the app and restarted it….after a while it did start to announce the turns….. several miles later we took a different route and the app asked if I wanted to reroute, I accepted the rerouting- and it was spot on and properly rerouted me with the proper announcements.
Here’s the map number: 938760

and if it helps, here’s the Garmin record of the ride: https://connect.garmin.com/modern/activity/22385365267

thanks,
FG