Constituent update batch freezes after resolving duplicates

After importing several constituents using a constituent update batch and resolving duplicates, the batch freezes for several minutes and returns the error message:

An unknown error occurred during the import the request. This could indicate a request to an invalid endpoint or a problem with the web server configuration.

 
 We are currently evaluating this issue and will update this article when we have more information.

Environment

 3.0.516, Service Pack 8

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