Hi , 

When you see the error you mentioned, do you see it in the Replicate log? or in the MS SQL log?  If the error is related to Replicate please open a case in the SalesForce and attach to the case the task diagnostic package & the logs with the error so we can further analyze it and get more details on the Replicate version you are running and the its settings.

If the error is in MS-SQL logs then please contact your MS-SQL DBA. 

thanks & regards,

Orit