Sandisk mp3 sound problem
Well I had The Same Problem. I Thought it was the headphones and it wasnt. I ended up ripping the new headphones.
I Was really mad i Opened up the whole Player and Disconnected Everywhere and found that it was the earphone jack. the soldier it had was very cheap so it had no contact whatsoever. I connected it by bending the metal and closed the player back up and till today it now works.
I think it is your earphone jack. sansas have very cheap earpphone jack soldier or something.
I encourage you to open up the player and check the soldier. I you want contact me and ill post a video on how i did it. Hope this works.