hi guys car wouldnt open today with fob fitted new batt. still wouldnt open tried another batt. car opened but so did windows, closed windows locked car o.k went back later opened again windows came down. car o.k locking wit keys. noticed if you press unlock on fob the light flashes for 2 or 3 mins before going out. any ideas. i ran a scan no faults. could it be duff batt.