iOS Storekit2 Appstore production environment, some user feedback in app purchase faliure, What our log records is StoreKitError.unknown，please How to solve problem, thanks

iOS Storekit2 Appstore production environment, some user feedback in app purchase faliure, What our log records is StoreKitError.unknown，please How to solve problem, thanks

ios app from app store some day，unable to read, write any file, included SecItemAdd What is the possible cause? thank you

suddenly iOS app release sandbox file fail to open [/var/mobile/Containers/Data/Application/52B6A7C2-2F2C-400F-8D6B-4B500434F918/Library/com.zhibo8.client81136870/UserDefault/mmkv/cache], 1(Operation not permitted) some device restart recover

SecItemAdd success, but app startup SecItemCopyMatching return NotFound