I have a 2012 Versa and last week car did not start. I thought I left llights on or something band boosted the car. It drove fine for a few days and now it won't start again. I boosted it and it starts. I'm thinking the alternator is discharging the battery and would like to know from others if the alternator is a problem with the versa. The car was bought new in Oct 2012 and has 50,000 miles on it. I think it is out of warrantee after 36,000 am I correct?