sound just stop in middle of audio book

I know had that happen to me before also.   I switched to other books on the clip with the same results, time played still scrolling by with out sound.  ended up removing all of the books on the clip and reloading the files again.  what ever had caused the unit to go silent, seems to have righted itself.  just had to ff to the time of the blip and all is now well. 

Thanks again for all the help in things to try.

denise