Wolfrx8

I recently got a 2004 RX-8 and all is well aside from a few minor things,one of the most troubling is the alarm which seems to have a mind of its own.Whenever the car is locked the car alarm just kinda decides to go off whenever it pleases which,needless to say, is VERY anoying and as far as i can tell the only way to keep it from doing so is to leave the car unlocked which i really dont like doing. Can any one give any advice on how to stop this fromm happening?