Bug outside IDE only in Release mode

Hello, I have a bug only is release mode outside IDE : in fact, if the debug
symbols are not set, the bug occurs :

<DebugSymbols>false</DebugSymbols>
<DebugType>None</DebugType>

But if the debug symbols are set, the bug does not occur :

<DebugSymbols>true</DebugSymbols>
<DebugType>pdbonly</DebugType>

The bug is : "Object Invalid or No Longer Set"
System.Runtime.InteropServices.COMException (0x800A0D5C):
at dao.Recordset.Close()

I tried to put the close statement in a try/catch bloc, and I tried also to
check IsNothing, but without success.

The bug occurs only if I try to read at least one value of my dao recordset:
Dim myVal% = CInt(myDaoRecorset.Fields("myField").Value)
(if I just travel the recordset without reading values, the bug does not
occur)

Within the IDE there is no bug, in release or debug mode.

Does anyone has an solution ?
Thanks.
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Patrice Dargenton
(E-Mail Removed)
http://patrice.dargenton.free.fr/index.html
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