We just did an upgrade to CU66 Dynamics NAV 2016, We have NAS service created separately, we found below event log related to NASService. Also heart beat of Job Queue is not getting update at the first instance when the service starts, in the next try it gets updates.
Server instance: LiveNAS
Session type: UnknownClient
Session ID: 2
Action completed successfully, but it took longer than the given threshold.
Execution time: 3876 ms
Threshold: 1000 ms
Message: Long running SQL statement
Task ID: 3
Statement: SELECT "User Code" FROM "ABC-live".dbo."Object Metadata" WITH(REPEATABLEREAD) WHERE ("Object Type"=@0 AND "Object ID"=@1)
Session type: Background
Session ID: 4
Action completed successfully, but it took longer than the given threshold.
Execution time: 1733 ms
Threshold: 1000 ms
Message: Long running SQL statement
Task ID: 3
Statement: SELECT TOP (1) "timestamp","Code","Description","Job Queue Category Filter","Server Instance ID","Session ID","Last Heartbeat","Started","Start Automatically From NAS","Start on This NAS Computer","Start on This NAS Instance","Running as User ID","Session Unique ID" FROM "ABC-live".dbo."ABC Go live$Job Queue" WITH(UPDLOCK) WHERE ("Server Instance ID"=@0 AND "Session ID"=@1) ORDER BY "Code" ASC OPTION(OPTIMIZE FOR UNKNOWN)
AppObjectType: CodeUnit
AppObjectId: 448
