Occasional .Net InvalidCastException from w/in MapSQLTypeToiDB2DbType

We have an ASP.Net (C#) application that occasionally (as in we're fine
for weeks, and then it will happen) will start to throw an
InvalidCastException (stack trace below). We've tried Googling the
MapSQLTypeToiDB2DbType and there are no hits. Anyone seen this error
happen? Any ideas on how to fix? It's on a simple select statement
selecting 3 columns from a table, a char, a decimal, and a char column,
and the code runs w/out a problem most of the time. It's as if the i is
returning different meta data for one of those columns at some point.
Once it starts we need to kill the asp.net process to get it fixed.



-Walden



[InvalidCastException: The data type returned is currently not supported
by the provider.]

IBM.Data.DB2.iSeries.iDB2DbTypeUtility.MapSQLTypeToiDB2DbType(DcSqlTypes
sqlType, Int32 colccsid, UInt32 length) +779
IBM.Data.DB2.iSeries.iDB2Command.DeriveParameters() +778
DataHelper.Data.ExecuteDataset(String commandText, CommandType
commandType, Object[] parameters) in
E:\dev\Condor\PaymentSite\Data\Data.cs:119
DataHelper.Data.ExecuteDataRowInternal(String commandText,
CommandType commandType, Boolean ThrowOnError, Object[] parameters) in
E:\dev\Condor\PaymentSite\Data\Data.cs:75
DataHelper.Data.ExecuteDataRow(String commandText, CommandType
commandType, Object[] parameters) in
E:\dev\Condor\PaymentSite\Data\Data.cs:60
BusinessObjects.PaymentRequest.GetPaymentRequest(Guid
paymentRequestGuid) in
E:\dev\Condor\PaymentSite\BusinessObjects\PaymentRequest.cs:44
CSRPayments.ProcessPayment.Page_Load(Object sender, EventArgs e) in
E:\dev\Condor\PaymentSite\CSRPayments\ProcessPayment.aspx.cs:23
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object
o, Object t, EventArgs e) +15
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object
sender, EventArgs e) +34
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +47

System.Web.UI.Page.ProcessRequestMain(Boolean
includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
+1061