Check for this simple mechanical problem. The CD player has to clamp the disc to spin it.With age the friction surface on the upper clamp can wear causing the disc to slip/skip during play. Using a paper ring on the CD upper friction surface (donut shaped ring area on side opposite of play area)should allow the CD to be clamped and played if this is the issue. Used to have this warm up issue with a Linn Genki before I opened it up and put some thin contact paper on the top clamp ring
