101% of alarms are more trouble than they're worth.
No one pays any attention when the damned things go off anyway!
My auto-electrician mate hates aftermarket alarms, whenever he encounters weird diagnostic problems on a car equipped with an aftermarket security system, the first thing he does is disconnect the bloody thing... most of the time the problem goes away, then he has to redo the amateur hour wiring efforts used to fit it.
Crap crimp connections and those bloody awful pigtail connectors are usually the problem (even with so called professionally fitted units)
My mate solders the terminals on and uses heat shrink to insulate.
This will make the system and car much more reliable, but wont compensate for poor quality manufacturing practices or mismatched components used in the alarm system itself, false alarms may still and probably will occur, as most, if not all of this stuff is Chinese rubbish.
"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"