Hey what's up guys, got this weird alarm issue with my car. I have a 2003, 120,000 miles or so 330i zhp 6 speed. When I park the car I hit the button on they key, car locks and gives me a beep, all is well. About an 1 hour parked and the alarm goes off for no reason. So I go outside and open and close all the doors, trunk and even the hood. I'm thinking one of the door sensors that's tells the car if the door is open or closed could be getting stuck. After I do this I hit the button on the key, car locks with a beep, all is well. 30 min later the alarm goes off again. This is the stock BMW alarm.
I have heard that a weak battery could cause this. I do have the original battery but I haven't had any problems with it. The car always starts even in the sub negative degree weather we have been having. Voltage on the battery is 12.3 and the little window on top of the battery is a solid green color indicating the battery is still good.
What do you guys think?