Join Date: Mar 2006
Location: Far East End of Hamilton, ON (Lake & Barton, 11th floor facing WNW)
Does this happen by remote also (assuming the CD player has remote capability).
Sometimes the open/close buttons can become dirty themselves, and "double bounce" electrically. I've come across this before, but usually the result is it starts to open, then closes immediately. Trying to insert/extract a disc usually results in a scratched or cracked disc and sore fingers. :-(
Some players use microswitches and as others have correctly noted, dirty contacts cause a number of failure modes. Some do it optically (not as common) and those can become dirt encrusted, requiring cleaning.
DAB listener 12/2003-11/2011 (DAB Off-Air since 11/2011)
HD radio Listener (where /when available) since 06/2010