My wife's 2009 Mazda 2's alarm has taken to going off at 3am.
Parked roadside on a quiet cul-de-sac so no heavy traffic but somewhat embarrassing. I've disabled the internal intruder sensor and spent some time opening and closing bonnet, doors and boot.
I'll see if I can find a Mazda forum but folk on here seem to have come across and resolved most problems.
Failing a solution which would be preferred, a main dealer or an independent auto-electrician.