I’ve discovered a reproducible bug on my phone that completely crashes the app - I have Touch ID enabled.
If after the dialog for Touch ID appears and authenticates my fingerprint I leave my finger on the home button for a few seconds until the app has loaded into the pulse screen then the app will completely freeze and require force quitting.
If I remove my finger from the home button after the authentication but before the pulse loads then all is well. This is very reproducible and happens every time.
iPhone 6 with the latest app and iOS.