why do cd players "sometimes" not read a disc?

My Lexicon RT-20 is sometimes refusing to read a disc that has just been playing?

ptss09-20-2013 3:55am

czarivey Details Discussions Posts This discussion Message User 4,494 posts 09-21-2013 at 06:50pm Copy Comment URL Report Comment Edit Delete Kng, I love my music server too!
knghifi Details Discussions Posts This discussion Message User 1,667 posts 09-22-2013 at 04:49pm Copy Comment URL Report Comment Edit Delete Czarivey, one of my USB external drive died but luckily it was backed up. It cost $89 so no big deal but if a CD player drive dies, a different story. Back up your music!
ptss OP Details Discussions Posts This discussion Message User 1,649 posts 09-22-2013 at 07:40pm Copy Comment URL Report Comment Edit Delete Thanks Jafant. I have been pleased with its sound; but I found it benefited "dramatically" with ac isolation and conditioning. I found conditioning and isolating the ac provided a quite remarkable transformation. It makes me very curious about what internal parts related to power supply should be upgraded, and how.
ptss OP Details Discussions Posts This discussion Message User 1,649 posts 09-25-2013 at 03:22am Copy Comment URL Report Comment Edit Delete I find moving the disc around in the tray can result in it playing. What gives????? Can it be dirt on the laser?