Fix slow responding GUI when PLC is not found

[PhOstmann]

What is the issue/what feature do you want to develop?

When developing or running a GUI built with VBAixGUI the GUI is responding very slowly when the PLC can't be reached via network.

What is the current application?

Developing/Using a GUI built with VBAixGUI

What are the requirements?

How do we want to solve it?

Check for multiple failed connection attempts and interrupt automatic reconnect.