Windows 20H2 19042.867

But I have had the problem for years.

Get the same problem of random freezes with Serviio and Emby.
Can go weeks without a problem and then a day or 2 of random freezes.

Excerpt from Emby log from a freeze:

Code:
2021-03-30 18:06:33.204 Error HttpClient: <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<s:Fault>
<faultcode>s:Client</faultcode>
<faultstring>UPnPError</faultstring>
<detail>
<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">
<errorCode>718</errorCode>
<errorDescription>ConflictInMappingEntry</errorDescription>
</UPnPError>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>

2021-03-30 18:06:33.224 Error HttpClient: <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<s:Fault>
<faultcode>s:Client</faultcode>
<faultstring>UPnPError</faultstring>
<detail>
<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">
<errorCode>402</errorCode>
<errorDescription>Invalid Args</errorDescription>
</UPnPError>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>

2021-03-30 18:06:33.227 Error PortMapper: Error creating port map
	*** Error Report ***
	Version: 4.5.4.0
	Command line: C:\Users\ndmma\AppData\Roaming\Emby-Server\system\EmbyServer.dll -noautorunwebapp
	Operating system: Microsoft Windows 10.0.19042
	Framework: .NET Core 3.1.9
	OS/Process: x64/x64
	Runtime: C:/Users/ndmma/AppData/Roaming/Emby-Server/system/System.Private.CoreLib.dll
	Processor count: 8
	Data path: C:\Users\ndmma\AppData\Roaming\Emby-Server\programdata
	Application path: C:\Users\ndmma\AppData\Roaming\Emby-Server\system
	MediaBrowser.Model.Net.HttpException: MediaBrowser.Model.Net.HttpException: <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<s:Fault>
<faultcode>s:Client</faultcode>
<faultstring>UPnPError</faultstring>
<detail>
<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">
<errorCode>402</errorCode>
<errorDescription>Invalid Args</errorDescription>
</UPnPError>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>

	   at Emby.Server.Implementations.HttpClientManager.CoreHttpClientManager.SendAsyncInternal(HttpRequestOptions options, String httpMethod)
	   at Emby.Server.Implementations.HttpClientManager.CoreHttpClientManager.SendAsync(HttpRequestOptions options, String httpMethod)
	   at Mono.Nat.Upnp.UpnpNatDevice.GetSpecificMappingAsync(Protocol protocol, Int32 publicPort, CancellationToken cancellationToken)
	   at Mono.Nat.Upnp.UpnpNatDevice.CreatePortMap(Mapping mapping, CancellationToken cancellationToken)
	   at Emby.PortMapper.ExternalPortForwarding.CreateRules(INatDevice device, CancellationToken cancellationToken)
	Source: Emby.Server.Implementations
	TargetSite: Void MoveNext()