Everything stops at 3:01

I have songs I've purchased on itunes, ripped from CDs, and downloaded from the internet over the years. They all work just fine on both my computer and iphone. But recently everything I add just stops at 3minutes 1 second. I can't figure out why, and I don't know what to do. I can click past the time and the song will finish, but 3minutes 1second is causing some problems