I previously had a Samsung Galaxy S4. I was using a 64 GB card in that phone. A few months ago I upgraded to the S9+. I inserted the SD card from the S4 into the new phone and everything has worked fine until I ran out of space so I bought a 128 GB card. While trying to transfer data from the 64 GB card using an adapter and plugged into the USB port on my computer I was getting errors. I found a post on this forum for using the command prompt that seemed to work for a bit. After a few minutes of transferring the data the adapter which is brand new disconnects from the USB port. I have tried all the ports on this computer and another computer. I have also ran the scan disk from the properties menu within windows and no errors are found. Anyone else have any suggestions?