Aye, stock cable, as provided in the box. At first I thought it may have been my laptop (although Windows 10 is fully updated) and tried it on my partners HP. Same thing. What's weird is that transferring a large folder (ca. 5000 files) was done okay (after one failure). I could see files transferred and then, when it was done, while still connected via MTP, I could read the contents of my folder under Music, no problem. The problem was after disconnecting and re-connecting. Then, no read or write of files on my folder at all (lots of crashes of File Explorer which would cause also DX300 to disappear from drive list, while MTP was still ON).