Create a job that sets Auto Update Statistics on
You need to have a check using: 

SELECT name, is_auto_update_stats_on, is_auto_update_stats_async_on 
FROM sys.databases


For example:

IF 
(
    SELECT COUNT(*) 
    FROM [sys].[databases]
    WHERE [name] = 'AdventureWorks_2005' 
    AND [is_auto_create_stats_on] = 0
) = 0
BEGIN
    ALTER DATABASE [AdventureWorks_2005] 
    SET AUTO_UPDATE_STATISTICS ON
END
ELSE
PRINT 'The auto update stats is ON ... no need to worry !'