03 G35 alarm chirping at random
 

Help please! Went on a long trip, about 1600mi round trip. Next day when I get out of the car and push the door lock button, it chirps like normal. Then a few minutes/hours later it chirps all by it's self. Maybe once an hour, maybe 2 times a minute. Might do this for an hour or 5 hours straight.

Even if I leave the doors unlocked, it will still chirp and blink the parking lights at random times.

Problem is it runs down the battery if left a few days without starting.