Ipod update

[ikeym]

Hi guys , does anybody know if there is a update to make the ipod work better with the car or which ipod is best ? I am using a 160gb with about 3500 songs on it . I had 12,000 songs and took off the ipod about 9000 songs and it works a little better but still it keeps FREEZING UP --WONT MOVE FROM WHAT IT'S PLAYING & WHEN IT DOES VERY SLOW , VERY SLOW! outside the car on a headset it works perfect ? ----ALSO I FOUND WHEN COLD LEFT IN THE CAR OVER NIGHT THIS WINTER IT IS WORST ,BUT STILL WHEN I TOOK IN IN THE HOUSE AND TRIED IN THE MORNING IT WAS BETTER BUT SO SLOW I ALMOST DON'T USE IT & JUST USE THE RADIO ...LOVE MY IPOD SONGS BUT CAN'T STAND THE WAY IT WORKS WITH THE CAR ........... ANY HELP ? ANYBODY ELSE HAS SAME THING WITH THE IPOD WORKING THAT WAY ??