Lost dual display while adding singers disk to playlist

[Skybird]

Have used Hoster 4 times at shows. The second display goes out in the middle of the show. This always happens when I'm adding a song from a singers disk to the database, while a singer is already singing. Then the 2nd display disappears. I shut down Hoster, restart the laptop & it keeps telling me I only have 1 display. I click on extended desktop, restart the laptop and it just won't hold. I did that for 2 hours while running my show on a regular karaoke machine. At the end of the show, I shut down my laptop, unplugged & replugged in the video cable & all worked. This happened in 3 shows, all while "adding to playlist" from a singer's disk while someone is singing at the same time.
On the 4th try, I only played songs already on the laptop - and played all singer's disks from my separate player. This time the display stayed.
So.......... how can I add from their disk while someone is sinigng without losing my second display? It's a pain going back and forth between 2 machines because so many singers bring in their own disks.