Don't have my JGC yet, but I have had that happen even in my Audis and found it was from random encoding errors when I burned my MP3 to the audio-CD format. Try a re-burn and see if that does the trick.
My 730n is playing burnt mp3 discs with no prob so far.
2011 WK2: Limited, 4x4, Hemi, 730n, Class IV Tow, Brilliant Black. 30% Ceramic Tint, Lockpick, LED DRL, LED License Plate, LED Backup, LED Liftgate (all), Axle/Transfer Case OEM add-on skid plates, Sharkfin Antenna.:thumbsup: