Domonial Fault

[John1000]

Can anyone help. I have a Domonial system which is now around 18 months old. Around four months ago, one of the external sirens started to go of randomly even when the system was disarmed.I changed the batteries which seemd to fix the problem, but this week the same thing has started again. It is just the external sounder which goes off, and all the lights on the panel flash until I reset with the prox tab.

Any one got any thoughts on this??

Thanks