https://support.microsoft.com/en-us/topic/kb3011465-fix-sequence-object-generates-duplicate-sequence-values-when-sql-server-2012-or-sql-server-2014-is-under-memory-pressure-20eca52e-baf9-4c4d-ad0f-0000cd84eb0f
KB3011465 - FIX: Sequence object generates duplicate sequence values when SQL Server 2012 or SQL...
Fixes an issue in which duplicate sequence values are generated in SQL Server 2012 or SQL Server 2014.