I am trying to transfer pics and video from my Galaxy Note 4 to my PC. I connect via USB and change from connected as installer to connected as media device. I view the files on the phone (these pics and videos are on the phone itself, not the SD card). And I choose which files I want to transfer and the transfer fails after 1 or 2 with the error message "a device attached to the system is not functioning". So I have to disconnect the phone, reconnect and go through the steps again...only to have it fail again. Every time. Every single time. What's going on? What can I do to fix it? I really need to get these pics/videos backed up. Thanks.