I have searched the threads and not found this, please let me know if its covered somewhere.

On our Xmas foray to Sydney, we played a series of 7CDs, a talking book to keep the back seat in order.
All good except every twenty minutes, give or take, the CD audio would be broken by a loud beep followed by resumption of play.
I have asked about it before and as the dealer couldnt repeat the error, we didnt worry. Dont play that many CDs, but also running up to the end of factory warranty, (we do have extended) it has raised its head again.
So we had accepted it was one of those things. However, on this trip it became a right PITA.
It probably happens once per CD on average I think.
What to do? Any suggestions are welcome.
Cheers,
Yowie