I have a 2003 Impreza 2.5RS that does the same thing. Hazard lights stopped flashing with the remote after a couple weeks. I bought the car 2 years ago. I have also had a couple isolated incidents in which the key fob would not work at all (would not turn alarm off or on). If you have had yours checked out since your post, or are going to get it checked, let me know if there are any findings. Thanks.