Ok, I have a 1988 S4, The car when I bought it back in 2012 had an after market alarm system in which I had removed do to the fact that I had to dis-connect the battery every time it went off for no reason. So I had the factory system re-connected. Every time I lock the car, the alarm would go off 10 to 15 minutes later. it would come on for about 30 seconds. One thing I did notice is that it comes on more often when the car is hot during days with temps above 70 degrees. How can I fix this and what should I be looking for?