Why does the USB disk app act erratically when I open it to view files? Is it because I have a lot of files in it. After a while it works OK; but searching files is usually, choose file, open file, wait, wait, wait, then I can scroll and search the file for the page I need; but scroll from page to page is not smooth a lot of times. Should I try to delete files I have in it I'm not working on and see if runs smoother with fewer files in it? I know there is less than half of the memory in my iPad being used for files.