Stop playing audio after render

Ok, So I been working on a 2 song session, On the montage workplace and the 2 songs as tracks. they have plug ins and also at the master bus there’s some plugins. So after struggling on getting an error message that I can’t render to the folder I created (that was a pain…) So I manage to render to desktop then copy songs to the respective folder. Hours laters I re-open the project and Now when I hit play it just reproduce about a fraction of a second and drops the audio… I have no idea what might be causing this.