disc tray keeps opening

At random tonight my top CD drive opened (HT-DT-ST DVD+RW is the name of it in Device Manager), and it just won't close. I mean, I can close it, and it opens a second later. I've put in various CDs and closed it, I've restarted the computer, hunted in Help, opened Device Manager and updated the driver. It just pops open a moment later. Any advice? Thank you.

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