Ultra Dual Drive 3.0 stopped working after 6 months

I get a partial picture of what I tried to copy from my phone (SDcard) to the Dual Drive and the same one (complete) when I transfer from the SDcard directly to my computer. I am using the Memory Zone app to copy and follow the directions in the app. I am not getting any error message during the copy mode, it just says ‘Done’ when completed. When I look at the file on the Dual Drive it shows an incomplete picture.
The file size of the picture is 208 KB. I have copied from the SDcard on the phone to the Dual Drive many times before that are much larger for 6 months. Now it will not copy complete pictures.