The most common issue that makes these go off without any reason are the following.
Bad key fob. If you have one, you can have it tested at any parts store, they will be able to tell if any of the buttons are sending false signals.
Then, the hood switch. Under the hood you can see a push button switch with a rubber boot on it. You want to be sure the boot is in good shape and the hood is good and tight when it's closed. If the switch is bad and the hood is a little loose, it can cause the alarm to go off.
Finally, the key lock switch on the doors. Sometimes there is water intrusion on the switch and it can cause the alarm to go off. To access these you have to remove the door panels and take a look at the back of the lock cylinder. If the wire is broken or if there is corrosion then the wire needs to be repaired and the switch changed.
Please let me know if there is any more I can do to help you from here.
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