Fix For Sticking Drive Door

I have a MicroAdvantage 16 X 8 CD/Dual Layer DVD Burner. It works great with one exception, often when I try to open the door or eject a disc that’s already inserted the door will stick. Is there a quick fix for this, such as a spacer that can be placed behind the door of the drive?

Thanks In Advance,
Jim Brown
J and J Video
Melbourne, Florida USA