As it turned out the culprit was the de-provisioning/re-provisioning of the UPSS (which happens during SP backup process). Each time the UPSS was re-provisioned, that mapping dropped. After reaching out to a familiar and trusted resource, Trevor Seward, he was able to determine the root cause. Please see his blog-post for explanation/resolution. http://thesharepointfarm.com/2014/04/name-user-profile-property-mapping-blank-reprovisioning
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