just bought an a3 1.9 130 2 door of my brother yesterday! he has owend the car for over a year and has not suffered this problem! problem is when you lock the car the alarm sounds anywhere between 15 mins to 2 hours after i lock it! i have removed 2 magic trees from the rear grab handles! i have cleaned all of the grease of the bonnet catch an checked the micro switch is connecting and cleaned th connection block i have checked that the rear wiper motor is not leaking! i have removed all lose or hanging items from the car can anybody help please!