"NO DISC" error on cd player

Hello,

I have an older KAVENT CD 731 CD player (with HDCD chip) that is on the old side, but has not had much use and is in mint condition.  It lives in a climate controlled environment. I am having a unique problem.  I will put in a Redbook cd, load the tray, then I get the "no disc" error.  Same thing after 3 attempts.  Then, just for laughs, I inserted a cd that has the HDCD encoding, and darned if the thing seats just fine and plays just fine.  THEN, when I remove the encoded CD and put back in the Redbook CD, it plays!!!  Does something need to be cleaned inside that I could do with a q-tip and some cleaner?  Or should I find someone who can service it?  Any suggestions would be appreciated.  Thanks!