Vauxhall vivaro hazard lights?

I have an 03 vauxhall vivaro with 76k, the hazard lights keep turning themselves on. It started when I double lock the van using the fob, then I would unlock it and they would stop. Now they just go on and off at random. And even with the engine running the other day, luckily I was still on the drive way. I now disconnect the battery when its parked at home, as it does my head in.