Hi Sreenu,
1) What is the full version of your SQL Server database? You can run the following query to get this:
SELECT @@VERSION
2) What is the value for the instance parameters 'min server memory (MB)' and 'max server memory (MB)' ? You can run the following query to get this:
select value_in_use from sys.configurations where name in ('min server memory (MB)','max server memory (MB)')
3) How much memory do you have in your database server? Provide the results of the following command:
systeminfo.exe | findstr Memory
4) Do you have any backup or DBCC CHECKDB job running in the database during the times you observe this error?
Best regards,
Luis Darui