I bought a Samsung LE40A686M1FXXU last January. As soon as I tried using the MP3 player system with a USB pen I noticed that the tunes were being played too fast! It was running 3.5 seconds per minute too fast - very annoying if you are playing your favourite songs. It has taken until today (28/4) for Samsung to admit they have a problem and fix it. I tried another 6 series in Comet - it was exactly the same. I recently noticed that the sound coming out of the phono sockets at the rear of the set were not in sync with the pictures. The cure for the other fault has fixed that also. Try your set.