How to debug an intemittent error using Progress OpenEdge database

I have a program that fails intermittently in a complex query.

The error reads:

System.Data.SqlClient.SqlException: Cannot fetch a row from OLE DB provider "MSDASQL" for linked server "LinkedServer".

The query looks like this:

SELECT Replace([JOB-NO],'M0','') as KeyTaskID,
dbo.SFGET_UniqueTaskID([CLIENT-CODE],Replace([JOB-NO], 'M0', ''), 0, [TRADE-CODE]) AS HMSUniqueTaskID,
[LATEST-PRIORITY] AS PriorityCode,
[KeyProperty] AS KeyProperty,
Replace([JOB-NO],'M0','') AS KeyJob,
[JOB-TYPE] as TaskSubType,
CONVERT(varchar(6),[MAINT-OFFICER]) AS Officer,
LEFT(FORENAME + ' ' + SURNAME, 50) AS OfficerName,
[JOB-NO] + ' ' + LEFT(RTRIM(REPLACE([TEXT-LINE], ';', CHAR(13))), 480) AS Description,
dbo.SFGET_FormattedDate([TARGET-DATE],0) AS DueDateTime,
[CURRENT-STAGE-CODE] AS CurrentStageCode
FROM openquery(LinkedServer, '
SELECT DISTINCT
"RM-JOB"."JOB-NO",
"RM-JOB"."CLIENT-CODE",
"RM-JOB"."LATEST-PRIORITY",
"RM-JOB"."TRADE-CODE",
"RM-JOB"."JOB-TYPE",
"RM-JOB"."TARGET-DATE",
"RM-JOB"."MAINT-OFFICER",
"RM-JOB"."TEXT-LINE",
"RM-JOB"."CURRENT-STAGE-CODE",
"RM-JOB"."PLACE-REF",
"IH_OFFICER".FORENAME,
"IH_OFFICER".SURNAME
FROM "PUB"."RM-JOB"
LEFT OUTER JOIN "PUB"."IH_OFFICER"
ON ("IH_OFFICER"."OFFICER-CODE" = "RM-JOB"."MAINT-OFFICER")
WHERE "RM-JOB"."JOB-TYPE" = ''GASS''
AND "RM-JOB"."JOB-STATUS" = 06
AND "RM-JOB"."CONTRACTOR" = ''NWH001'' ') as ibsTasks
INNER JOIN [SVSExtract].[dbo].Property prop
ON ibsTasks.[PLACE-REF] = prop.UserCode


I have been testing it manually using SQL Server Management Studio. It occassionally fails but it mainly works OK.

I am at a loss as to how I can debug an error that I cannot reproduce at will.

Any suggestions?

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