About my Nav system, went to the dealer. They want 2500 for anew Nav computer , My car is a LR HSE 06 , with 51k miles; i just replaced the radator now the Nav computer goes bad, why is this vehicle falling apart at 51K miles. Why would a two year old computer go bad, could it be something else the dealer just checks it out and says repalce the whole computer are these thing fixable vs replace the whole thing???? Any advise from anyone