Thanks for this link - it is really informative. I understand that Crashlytics can be really limited, but I still want to understand why so many crashes are appearing with this generic name and stacktrace. Is there anything we can do to figure out more details? Could it be related to dSYMs? We also have a suspicion that these crashes are occurring in the background.

Yeah, if the app can't run it makes sense why Crashlytics wouldn't have time to upload it. Any idea why the stacktrace would be so generic? Could it be an issue with dSYMs?