veritas 8compact system - going off randomly?

Hi. we have a veritas 8compact alarm system with 3 zones plus one door being used on the alarm. Yesterday without warning & while not in alarm mode the alarm just went off and when I had put the code in it was flashing 24h and then I had to press reset for this led light on the panel to go off. The problem is about 5 or 6 hours later it did the same thing again & again at 7.45am this morning the same thing again. Does anyone know how I can stop this as I carnt go out just in case it goes off again? thanks stephanie.