Azera Infinity CD playing problem

2008 Azera - has infininty audio package.
When playing standard CDs, every 20 to
100 seconds the audio volume drops down
to 25% for about 1/3 of a second. No skipping.
Pressing fast forward seems to help - no
drops for at least 300 seconds after pressing FF.

Under warrenty - took it into dealer, they
changed audio head - the CD reader part.
That did not fix it. Problem occurs when
engine is off, or when on the highway.
(Not vibration caused. CD problem is
only on the Azera - same CDs play fine
in any computer, other car stereo or
home stereo.

 

Ask them to look at it again. The vast majority of issues with sound
level are caused by the amp. JBL amps have been especially
troublesome. On the other hand, the idea that fast forwarding
resolves the issue or that it only occurs when playing CDs suggests
that the problem is within the radio.

Help the dealer with how to duplicate this so they can perform
diagnosis while the problem is occurring and so they can check to
verify the system is repaired prior to returning the car to you.

 

Thanks - an update - the check engine light came on, and
the dealer replaced the tire pressure sensor and re-flashed
the firmware for the car - and that seems to have fixed the
CD playing problem.