I have a 2004 Nissan pulsar 1.8. I am starting to have intermittent problems with the door locking system using the fob. Recently with car left in ignition car just locked. Also another time car would not start until I locked the car and then opened it again with the fob. Another situation was when fob would not activate the opening of the doors when button pushed. New batteries do not stop this occurring and issue is intermittent??