for the benefit of anyone who has this problem I have got a reply from the makers
Sorry to hear that. Regarding your issue with power, it is related to features of your motherboard. Some motherboards, such as your's, include features such as always on USB ports which can cause issues such as this. I would suggest double checking your BIOS to see if it can be disabled on certain ports or use ports that do not have it if they are available. When the keyboard receives power without a data connection, the demo mode will run and it cannot be turned off.
My take on this , I don't intend to play around with the bios in case I do something stupid but whats the point in having a keyboard that in certain instances can go into demo mode and stop you typing.