when ever I play on a world, after seconds of gameplay, it crashs.

*What I expected to happen was play the game for more than five seconds.

*What actually happened was I play on a world it works for a second, then it lags, then it crashed.

1. pull up launcher and press play/play offline.
2. select any world and press play.
3. after playing any where from 5 to 30 seconds it crashes.