Windows 8 Graphical Issues

Well, at random points mid-game, on either game mode, the hotbar/inventory sprites for items will glitch. Same thing for held items. All blocks remain unaffected. Shortly after, MC runs out of memory, and it returns to normal until it starts again.

The Map in the background is Broville v10. Heres a link:
http://www.planetminecraft.com/project/broville-v10/