M240 "no files" no matter what I do

I’ve searched the forums, reformatted umpteen dozen times (MSC and MTP depending on which message I’ve read), loaded files under MTP and MSC.  Sometimes they show up on the MP3 player, all the time they show up on the device when you look at the files on the computer, but most of the time I get the message “no files.” 

Any suggestions before we throw it against the wall?  It’s been doing this since we had it - returning is not an option since we had a short warranty (refurb through Woot).