Sound Out

The program plays music for an hour. And then, the sound of the music cuts off. I have PC laptop Aspire R7. The program still plays the music but the system does play the song from the program. The sound on the computer still works, I tested the sound in volume control of it. Then, I have to re-open the program and then play the last song that I played to started up again. What should I do ? Should I re-install the program again? My DJay controller system is pioneer ddj sx2 with the best wiring systems that I bought for $10- $20 each.