ios - NSURLErrorDomain Code=-997 "Lost connection to background transfer service" -

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I am using NSURL session to download some MP3 files and store them in the device. Everything works well, but sometimes blue, the app crashes and I think this is a strange error. NSURLErrorDomain Code = -997 "Lost connection to background transfer service" . This is not a lot but when it completely messs up the whole app, like I mess up all the download tasks next time and to get me to work again on the device again Will have to rebuild. Note that I have received this error since using only Xcode 6 and IOS 8, even if I do not know whether it is related to ios8 or not.

This is a complete error description: 

  error domain = NSURLErrorDomain code = -997 "connection lost to background transfer service" userinfone = 0x178664100 {NSErrorFailingURLKey = http: // XXXXXXXXXX.mp3, NSLocalyated Description - Lost connection with background transfer service, NSErrorFailingURLStringKey = http: //XXXXXXXXXXXX.mp3}    
 
 
 What is the version of SDK? It was so that it could have been an accident, which was later fixed. I'll try it again

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