Error: Transaction (Process ID ##) was deadlocked on lock | communication buffer resources with another process and has been chosen as the deadlock victim. Rerun the transaction.

When activating a marketing effort, the Error: Transaction (Process ID ##) was deadlocked on lock: communication buffer resources with another process and has been chosen as the deadlock victim.  Rerun the transaction is received sporadically.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.9.1001.36
 2.91.1535, patch 37 ; 2.9.1001, patch 56 ; 2.91.1535, patch 18 ; 2.9.1001, patch 62

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