@geedie Try adding an exception/exclusion for the FAF Client in the AV software & Windows Security.
If that doesn't work, then please open RUN (Windows+R) & go to the following:
%USERPROFILE%/AppData\Roaming\Forged Alliance Forever\logs
You should see a client.log file (the one without the date). Please click the Reply button at the bottom between the 👁 (View) icon & the "Mark unread" button. Next, drag/drop that client.log file (the file without the date) into the Reply message window so those that can help (not me) have that data to look at.