Microsoft released security updates KB 5009543 for Windows 10 and KB5009566 for Windows 11 which caused signification issues with L2TP vpn connections. While the initial work around was to uninstall the security updates to resolve the issue, the updates would eventually reinstall within a couple of days. Microsoft has since released an update to help resolve the issue. Security update KB 5010793 for Windows 10 and KB 5010795 for Windows 11.
You can download the updates from their respected Update Catalogs below:
https://www.catalog.update.microsoft.com/Search.aspx?q=KB5010793 (Windows 10)
https://www.catalog.update.microsoft.com/Search.aspx?q=KB5010795 (Windows 11)
Select the appropriate version for your computer.