"Error: BCP failed" when extracting constituents

Hello all, 

Ever since upgrading to V15 we have been experiencing a BCP error when extracting constituents (see image below). At first it would happen once or twice before finally going through, but now it's taking 10-12 attempts before we achieve success. Any ideas of what might be going wrong? It's particularly confusing that it eventually does work - it takes so many attempts.  

 

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