"We use Crashlytics as part of Twitter's Fabric suite. It won't restart an app when it crashes but it contains a lot of really useful monitoring and logging tools.
It's also really useful for general monitoring through the…"
"That would seem to be somewhat odd - what version of iOS was running?
Are you sure you didn't have airplane mode enabled but the enabled WiFi afterwards? Or that the emails were sent once you turned airplane mode back on>"