We tested the LR-16 with the same HDD as well.
First of all, I would like to ask you to check the firmware version on your device. When you powering up the device you can see that version number in the boot screen.
Please make sure your device using the latest firmware release: 83859.
If you already using that firmware, please make sure you formatted the HDD with the LR-16. That is necessary because the LR-16 using different allocation unit size (which does not match with the windows default settings) , that helps to avoid from the dropouts.