Activex/COM connection between apps OK on win XP, unstable on win 10

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Windows

COM

ActiveX

Hi,

we are using ActiveX/COM connection from our applications (some in C++, some are Delphi, Win32) to manage ArCon (Windows CAD application). The connection (AfxConnectionAdvise...) behaves fine on Windows XP, there are some minor issues on Windows 7 and on Windows 10 there are major issues making the connection very unstable - the connection is often freezing randomly on both sides, sometimes causing app to terminate with connected ArCon remaining running.

The same version of ArCon and our applications are used on Windows XP, Windows 7 and Windows 10. On Windows XP the connection is very stable, on Windows 10 is very unstable.

I know this is very general question, so does anybody know what system libraries or parts of Windows are responsible for ActiveX/COM and what can cause worse and worse behavior in newer versions of Windows? Are there any system options/settings, which I can use to improve connection stability (priority, timeouts, memory...) in order to behave as on old Windows XP?

Thanks for any advice...

Petr

What I have tried:

The problem came up with Windows 10, the versions of our applications and connected ArCon application is the same as used on Windows XP/7. I have tested in on various systems, on Windows XP everything works fine, but on Windows 10 the connection seems to be insufficient and this leads to described problems. I have no source code for every our application, but their behaviour is similar...