For some reason my red "lights" light flashed occasionally when I press the brake, not all the time only occasionally. I did have a rear break light out and it came on all the time, I stuck a new bulb in it and the lights are all working.

 

For some reason though now, the lights light comes on every now and again? I have checked the lights and they all work, even checked it when the light comes on and they are fine?

 

Any thoughts?

faulty connection on one of the bulbs ;) make sure the terminals are clean on the bulb & the prongs they connect to.

Do you have your inner rear brake lights wired up as fog lights? If yes then thats the reason, if No then its a bad connection somewhere