If you register for a message in the ctor of your views code-behind, eg:

Messenger.Default.Register<DialogMessage>(this, DialogMessageHandler);

Every time you reload the view, i.e by navigating to it, the callback method (in this example DialogMessageHandler) can get called multiple times from the previous times ctor ran.

To fix this all you need to do create an event handler for the PhoneApplicationPage Unloaded and unregister the message (you can unregister more specifically using one of the other overloads):

Messenger.Default.Unregister(this);

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