Every time a user connects in to the RDH, firewall rules are made for the users Windows Apps but never cleaned down.
This can have a few issues linked to it like Black screening on the host or the start menu not displaying but depending on the Windows version you mileage will vary. In all case it can lead to slowing down of the system.
For Windows Server 2016 you will need to confirm the following update is installed KB4467684, Server 2019 should already be able to do this but I would bring it in line with all updates to just be sure.
Make a GPO if you have more then 2 RDH and put this Key in place.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy
DeleteUserAppContainersOnLogoff (DWORD)
Value: 1
No Microsoft document appears to back this up but it is listed in a few updates and talked about as a known issue under KB4467684
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