I have an ATT Galaxy S7 Edge. When I connect it to my PC to sync music, it will occasionally sync a few songs and then my music player (Musicbee) will report that the copy fails on the rest. At that point, I close Musicbee down and try to access my SD card on my phone, and it allows me to navigate the file system, but the files themselves are inaccessible. It will do this sometimes without me trying to sync as well, sometimes it will just take a few minutes of being plugged-in to USB for it to fail. Windows 10 is fully updated, I have uninstalled and reinstalled the Samsung USB drivers with the newest version, rebooted my PC and my phone, reinstalled the USB drivers on my PC, switched to PTP, and it's still not working. Any suggestions?