Hello: I hope someone has the answer for this problem. I have a viper alarm system the 280HF model to be precise. The alarm is coming to its second year of use and I have noticed something wrong in the past two months. What it use to happen was everytime the alarm was triggered the system will notify me by the number of chirps usually 1, 2, 3, of 5 and then it went back to its 2 chirps normal disarming. What it does now everytime is triggered after notifying me and won't go back to its normal 2 chirps. It keeps chirping 3 times and the LED won't stop flashing. I thought it might be because it doesn't detect a sensor. I checked the sensors myself by alarming it and testing that sensor but they all work fine.