Neowin reports some Nintendo 3DS users suffer from Black Screens of Death:
This issue was first spotted in a forum post on NeoGAF, and has been picked up by CVG and PCWorld, amongst others. The cause of the BSOD are mixed, but there are two common culprits. Some players report seeing this screen while playing Super Monkey Ball, while others report the issue stems from Super Street Fighter IV losing a wireless connection and going into a loop. Others also report the issue stemming from bundled 3DS applications.