I have a 2.5sl and I am experiencing some kind of problem. My car's alarm is like go out by itself many times and it locks the door after the door is already locker(like after I lock the car, the locking car sound appears moments later), and also the alarm goes off when I open the trunk(which it normally wouldn't happen). Anyone knows why, any suggestion?

you have an aftermarket alarm in your car that is why you are having a problem. trunk is normal for the alarm system but the rest is a problem sounds like there is a problem with the shock sensor on the after market alarm