WPF View constructor called on windows switch user or remote desktop login

Question

I have a WPF Window containing a ContentControl that uses a DataTemplate which is defined in the windows' resources:

<Window (...)>
    <Control.Resources>
        <DataTemplate DataType="{x:Type local:MainVM}">
            <local:MainView />
        </DataTemplate>
    </Control.Resources>

    <ContentControl Content="{Binding}" />

    <!--<local:MainView /> This Works as expected -->
</Window>

For testing, the MainView is a normal wpf usercontrol with no content.

In my MainWindow constructor I set the datacontext once:

public MainWindow()
{
     InitializeComponent();
     DataContext = new MainVM();
}

Normally, I expect the MainView constructor to be called exactly once if I never change the DataContext of my window.

However, it is called every time I log onto my machine using remote desktop or when I just press "Switch User" and relogin:

public MainView()
{
    InitializeComponent(); // <--- this is called upon loggin on
}

• Neither the window DataContextChanged event nor the MainView.Unloaded event are called.

• This only happens on my Windows 10 Pro 64-bit v1511 machine, but not on a Windows 7 PC.

• It also only happens if I use the ContentControl, not if I just create the MainView directly.

• If the screen is just locked, it does not happen.

Does anyone have an idea why this is happening or how I can prevent that?

I have found other posts on StackOverflow that might address the same problem:

WPF: Prevent unload & load after RDP (dis)connect

WPF re-invoke constructor when connect using Remote Desktop Connection (RDP) to pc