Alarm randomly going off??
 

I'm having problems with my alarm and it's really starting to do my head in :mad:

It can be fine for weeks then acts up for a few days and is totally random. No reason for it to go off but it does, never for longer than about 5 seconds then turns it self off. The other day i opened the drivers door with the engine running and it went off??

Is this a sign of the battery going bad or something else?