I have a Veritas 8 alarm installed 3 years ago and it’s worked fine. Last week whilst at work it went off for no reason. Zone 3 light was lit on keypad. I reset it checked the two pir’s for any bugs etc. The next day it went off again whilst I was out this time no lights lit on keypad. As it’s three years old I changed the battery which set off the tamper and somehow reverted the alarm back to factory settings.I only have two pir’s on zone 2+3 so i set those to guard and the rest of the zones to disabled via zone disabling suite. I armed the alarm and when out it went off again.I put alarm into programme mode pressed 4 / 1 and the tamper light flashes. I then pressed omit for further information and light zone 3 is on and light zone one flashes. I’ve checked everything for loose wires etc and it’s fine.When I do I walk test the two pir’s work as they should. Do any of you guys have an ideal as to what’s causing the false alarms any advice would be much appreciated. I’m sure it’s a minor fault