Actually I started one of the "other" topics. I never did find out what the problem was. And the problem I was having then is different. As the blink wasn't random flashes it was at a specific interval of about 2 seconds. This can be anywhere from less than a second to flashing very rapidly even when nothing is connected.
I fixed the problem last time by starting fresh with a new version. I guess I could try that again.
I was just posting incase someone else had experienced this. I've gone on holiday for a month and a half so I can't get back to fix/diagnose it anymore unfortunatly. Was worth a try.