Not only does my car alarm randomly go off, but when I hit the switch on the key fob to shut it down, it goes off again 5min later, and then does this repeatedly. I wake up in the middle of the night over and over again, 'cus the alarms randomly going off, and I have to disarm it.

I've checked my doors, my hood, my trunk, and everything's fastened securely; so I dunno what could cause this to happen. I've resorted to leaving my car unlocked in order to avoid it. I don't wanna have to do that however.

Secondly, watch this video ...
The airbag light comes on, and flickers, while the security light stays on, instead of blinking like usual after I lock the doors. Sometimes, it doesn't come on at all even.

Also, sometimes I can't lock/unlock the doors from inside either, although most times I can.

What is this mess???
Should I just strip the alarm system and get an aftermarket?
It's really annoying; I hate when my cars not 100%.