Without a lot more info it is impossible to guess. Try looking in the alarm manual. Most common would be a bad or dirty door switch which would cause the alarm to go off. Another, most alarms have a sensitivity adjustment. If the sensitivity is set too low, something as normal as a motorcycle driving by could set it off. It would be helpful if I new if you had a factory alarm or an aftermarket?
Week or dead battery on your remote. Change the remote battery, got nothing to loose except a couple of bucks
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