Okay, I don't have a solution to the corruption of files, but I have noticed that it only happens when I try to load more than 10GB of music to my Galaxy S5 with a Samsung microSDXC UHS-I 128GB card inserted. In the back of my mind, I think I knew that was the problem, as some computing devices often state you can only use "up to" a certain size storage component. If I go over 10GB, I have to live without the last files that won't transfer because deleting previously transferred files to make room at the end doesn't work. Otherwise, I have to reformat and start all over again.