Help Skyrocket media player .m4a problems

I own a Samsung Skyrocket and I'm having issues with .m4a files in my media player. It doesn't seem to affect .mp3 files. Basically it sounds like the signal is all messed up. Sometimes it affects both speakers or other times just one. Restarting the phones fixes it for a little while. Seems like it's the second play that starts be affected.

Am I gonna have to convert all my .m4a files to .mp3??? I hope not!!