Battery Dead problems of the 2001 Chrysler LHS

Been having electrical problems on going with the interior lights blinking on and off even when the car is parked and ignition is off. The electrical problems occurs approximately every 5-6 months increments, causing the battery to go dead. Can be driving down the road and the car will just cut off. Have spoken with several people with chyrslers that has been having the same or similar problems but there has been no recalls concerning the electrical components of the chyrsler. The problem has begin to get worser and worser. We need some help. There are several different complaints on various sites on the web concerning electrical issues with the chyrsler. This was a new car. It is not a used car. Could you please help or give guidance on how to handle this. There has been no recalls concerning this issue. The car has been on the interstate and just cut off.