Car Alarm Beeps? 5 times

#1
hi guys (and girls), I need some help! I have a 2010 Toyota Corolla. Tonight I set my alarm on my car and 2 hours later I was upstairs in my room and heard the alarm beep 5 times within about 2 seconds. I go down to my car and check and everything seems fine. I thought maybe the alarm wasn't set right so I unlock the car and lock it again. I go back upstairs and right away I hear those 5 beeps again. Lately I've been having trouble with my key fob not unlocking my drivers side door as well! Any suggestions as to what this beeping could be?
 
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