This is the 2nd time this has happened.. walk up to car and hit the unlock button on fob. Car lights flash, doors unlock, but when you get in car and push the start button nothing happens. No lights, no power, nothing. Won't respond to jump start. Had it towed to dealership and the said they replaced the battery in fob and placed in middle console slot and car started. They said they tested battery and alternator and everything was ok and no codes. Today the same thing happened again and have tried everything and car won't start.. any ideas?