Lync Room System is stuck to a "joining conference room to meeting" message when you join a Lync meeting

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Symptoms

Consider the following scenario:

You schedule a Microsoft Lync meeting in Lync Room System. Then, the scheduled meeting appears in the calendar of Lync Room System.
You select the "join meeting" tile on the table-top touch meeting console, or on the front-of-room touch displays.
You hear the sound that indicates that Lync Room System is connecting to the meeting.

In this scenario, if you try to join the meeting from another Lync endpoint, the Lync endpoint shows that Lync Room System has joined the meeting. However, Lync Room System is still stuck on the screen that displays the "joining conference room to meeting" message.