Security alarm going off at differnt times during nite .lights flashing ,horn blowingeverynight

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Yes I have a 2009 Hyundai in the middle of the night the security alarm goes off with the horns flashing and that lights flashing and I go out and start it it'll quit for a little while then it does it again what is the problem email lizfoote1943@gmail.com phone 613 602 6490 Ontario Canada