Thanks for the replies guys,
It's got the original software they came with when first released, I never got round to updating to V2.
I wonder whether a software upgrade may cure the problem?
If not it's going to have to be a visit to the place where I got it from, where customer service is shocking to say the least.
My unit always seems to run very hot to the touch as well, if yours aren't the same then mine's definitely a duff unit!