Pokemon Go just went through a major overhaul, but it still seems to be just as crashy as ever. It crashes while I walk around, it crashes when Im in the middle of a gym battle, it crashes during a raid, it crashes when one of my Poke eggs has hatched... Im constantly re-opening this app on my iPhone 6s.
I wish making the game stable was a higher priority for the devs because it looks like they are fixing other in game issues.
Doc Pop about Pokémon GO, v1.37.2