Error: Blackbaud.AppFx.UIModeling.DataFormWebHost. The remote server returned an error: (401) Unauthorized when navigating in Blackbaud CRM

After a period of inactivity users generate Error:  Blackbaud.AppFx.UIModeling.DataFormWebHost.  The remote server returned an error: (401) Unauthorized when navigating in Blackbaud CRM
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

 2.91.1535, patch 59
 2.93.2034, patch 42 ; 2.91.1535, patch 76 ; 2.94.1524, patch 22

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