Search results are not being returned

[drm]

I have a VB .net application that runs on one server that retrieves blocks of information from an AD LDS directory on Windows Server 2008 SP2 that freezes. There is a loop that controls what blocks to retrieve. I have added logging to my code to isolate the problem (see below) as well as on the AD LDS server. The process executes the FindAll command but the results are never returned. I can see an event log on the AD LDS with ID 1644 stating that entries are returned but the "processing result" log message is never written. AutoFlush was turned on for the LogWriter. Any suggestions on what could be causing this or on how to determine what is happening?

_myDateTime = DateTime.Now
LogWriter.WriteRecord("Launching query " & ds.Filter & " at " &
Format(_myDateTime, "MM/dd/yyyy HH:mm:ss"))
results = ds.FindAll()
Dim loopCount = 0
_myDateTime = DateTime.Now
LogWriter.WriteRecord("Retrieving results for - " & ds.Filter & " at " &
Format(_myDateTime, "MM/dd/yyyy HH:mm:ss"))
For Each result As SearchResult In results
loopCount += 1
_myDateTime = DateTime.Now
LogWriter.WriteRecord("Processing result " & loopCount & " at " &
Format(_myDateTime, "MM/dd/yyyy HH:mm:ss"))
....
Next

Note: This does not happen everytime. If the hung process is killed and the application restarted, it usually works.

FYI. The directory is populated with information from a database. This application extracts the data from the directory to be compared to the data in the database to ensure that the two are in sync. If there is a better way to extract the data, please let me know. I tried csvde but it did not work due to the volume of data.