I'm having a problem I've never seen before, with my 2008 Sentra. The clock set light, on the center console/radio, will come on while the car is shut off. It wants me to set the time. I try, but the clock set button is non-responsive. Then the clock will set itself and it will turn off, after about 30 seconds it comes back on, and the process starts over again. I thought it had resolved itself, but when I checked on it this morning, the car battery was dead.