Thanks guys,

I'll contact support, though I don't have a whole heap of electronics experience, I'll get in there and see what I can do if it makes things easier as I'm Australia, which makes UK tech support tricky

FYI, I've only had the unit 2 or 3 months and it's yet to go into a car (shaddup, I just bought a new one, ok? ) so I wouldn't think wear or vibration is the cause.

This site has a great FAQ, the problem is in fact it's too big! I've read the entire thing but don't remember that this was in there....

Ben