Fun game, lots of issue

What I like is following the trail around our local lake, which is just over 5km. I set up a buddy and loaded some eggs. After once around I hatched a 2km egg and was halfway toward the 5km egg. When I finished another round I checked my iPhone only to see that somewhere along the way the Pokemon Go app had crashed. So I checked, the 5km egg was now up to 4.2, after over 10 km of walking/jogging.
The app is very quick to tell me Im moving too fast, which often happens when Im standing still.
Also, Niantic, whatever you did in the last update that causes the iPhone to run hot, I wish you had done this back in January when it was cold outside. It would have been nice if the app doubled as a handwarmer as I was outside tyring to catch Pokemon or fight in a gym. Maybe thats my clue, if Im out running and my iPhone is hot, then the app is running. If its not hot, then I know the app has crashed, I need to stop and reopen it.

stmck about Pokémon GO, v1.31.0