I've recently added iCloud support following Apple's programming guide and was able to release an update that successfully migrated an existing store to a iCloud-enabled CoreData stack and for a few weeks everything in that update was going great and had no user complaints.
I have since launched a very minor update changing code that does not even touch the CoreData stack, and since then, users updating the app are experiencing their CoreData being completely wiped with the update. I've been going over the programming guides and posts for days now, but I can't seem to figure out what the hell happened.
Does anyone have insight or suggestions to help shed light on what could have happened with an app update to cause data loss?
EDIT: More details: I've verified each archive submitted to the App Store and both are using the Production environment for iCloud containers, using the same ubiquity container, and same entitlements. I'm stumped!