Remote Desktop Connections error after update to Win10 2004

after updating Windows 10 to version 2004 i am no longer able to establish a Remote Desktop Connection.

actually i am able to establish a Remote Connection exactly once. But after ending the first remote session every following attempt to do the same gives me the following error message:

"Your Remote Desktop Service session has ended, possibly for one of the following reasons:

The administrator has ended the session.

An error occurred while the connection was being established.

A network problem occurred."

just before the error message appears i can see the log in screen of the remote computer, but this is were it end.

Only restarting the remote computer allows me to create another remote session. but restarting the machine after every remote sessions isn't feasible as others use resources on this computer too.

the suggested help links to a website explaining how to enable Remote Desktop access. which doesn't really help. Before the Windows update the service worked flawlessly. Any help how to fix this issue is highly appreciated.

thanks,

Seb