Thanks for the reply Erik.
I have updated the firmware and changed the settings to the ones in the link.
I have also re formatted the SD card and tried to clear the data but the historic data seems to still download when I connect it.
With the new firmware it seems that each session needs to be saved to the memory card, is this correct? I have tried saving data to the card before downloading.
For some reason the sessions are still not being downloaded, the data still finishes mid way through the run in December.
The GT-11 seems to be recording data, the memory usage can be seen increasing on the unit under the memory settings.
Has anyone had similar problems?