This problem started just a couple of weeks ago. The CD/DVD reader's tray does not stay inside. It keeps poping out. I press the button to close it, it slides back into the drive but a few seconds later comes out again.
It happens mostly when it is empty, but it has also happened with a DVD in it.
My computer is only a few months old. It's a Dell, desktop, XPS series.
The reader is NEC DVD+-RW ND-3530A 16X (104C).