Prøv at ændre din kode for at bortskaffe din OracleCommand-instans, ellers vil du have en ressourcelækage, som kan være årsagen til dine problemer.
Dim connString As New String("Data Source=...")
Using conn As New OracleConnection(connString)
Using cmd As New OracleCommand()
Try
conn.Open()
Catch ex As OracleException
logger.LogError(ex.ToString())
Throw
End Try
End Using
End Using