puegot 607 stan nav and stereo probs

Hi

i have just bought a peugeot 607 52 plate 2.2 HDi SE, first of all the Sat Nav (VDO siemans)just seems to stop working and throws up the message "cant read disk wrong disk please eject and insert corrrect disk" what could be the problem, does it just need updated if so where to buy and how much. my second problem is the stereo (RM2). it is a clarion 6 disk cd changer (in the boot)it just switches off first i thought it was the cd changer/player but it also does it to the radio. then i thought it was due to playing too loud but no. it does come back on again after a short while but then i cant change cd/track/ or change to radio of if happened while listening to radio cant change station or to cd the control stick also becomes obsolete. it does go back to normal when i restart the car. gave it to garage i bought it from but they cant find the prob. could it be the amp not sure as like i said i cant control it once it comes back on. please help...anyone

[Add comment to CAR-GURU.com] [Start blog at CAR-GURU.com]