Ikemi owners?

Hello all,
I recently bought a used Ikemi player that was never used.
It plays all commercial CDs beautifully well but becomes very inconsistent when playing CDRs. It won't play many even though the total time and songs is displayed! When it does play a CDRs, the Ikemi struggles finding tracks (forward or backward), usually gets stuck and stops. The same CDRs sometimes play, sometimes don't! Some songs can sometimes be accessed with forward/backward, sometimes not!...
Has anyone else experience similar behavior with the Ikemi? or is it simply in its nature?
I forgot to mention my CDRs are burned from itune on a Mac and I use middle of the road silver Memorex discs, if it is of any relevance...
Any feedback will be highly appreciated, thanks in advance,

C.