If you speak about network connection between the OPC client and OPC server (and not about possible network between the OPC server and its target device), then, in fact, there are no qualities or status codes to speak of.

The quality (OPC Classic) or the status code (OPC UA) is part of the data being transferred between the client and the server. If the data cannot be transferred, the quality/status code cannot be transferred either.

In case of network problems between QuickOPC and the OPC server, the methods that return single result throw an exception. Methods that return an array of objects derived from OperationResult return a non-null value in the OperationResult.Exception property.

I will need to see parts of your code, especially those that process the results, in order to be able to tell more. I suspect the problem is more in the understanding of how to process the results, rather than some in kind of bug in the component.

Best regards