hey my aftermarket alarm/keyless entry has been going off for a split second at night, usually once or twice. It only happens if I lock the car. It never happens during the day. No cats and its not sensitive at all. I took it to the shop twice and they changed my fuse wires around and now my parking/fog lights go on and off in correlation with setting the alarm on and off, which is very cool, but it didnt fix my problem.
also since they "fixed" my fuse wires whenever I open the car door I hear a tiny beep that was not present before.

 

maybe its not grounded right

 

sounds to me like they didnt hook up the door triggers correctly.... what system is it and what sensors do you have