 I bought my Frontier late last year, 
and was quite happy with it until 
March of this year.  The driver's door 
handle broke off; the electronic 
control module needed reprogramming; a 
grinding sound and kerchunk developed 
in the left front end; the driver's 
door window regulator went bad; and 
the gas mileage suddenly, and 
inexplicably, went down about 4-5 mpg.
The service department was very 
courteous and wonderful in all 
respects.  I simply decided to cut my 
losses and trade the truck in on 
something else while it still had most 
of its value, and before anything else 
went wrong.