just letting people know that my 3ds sometimes freeze after i put it to sleep mode. what happened is black screen after i open the 3ds. this happened 2 times with mario & luigi : dream team and Bravely default. i tried pushing different combination of buttons but it didn't do anything so i must button-reset my 3DS. i'm using GW3DS with 6.3 emunand. posting this so this problem can be addressed properly and won't happen to anyone else in the future. so just to be safe, don't put your 3DS to sleep during gameplay.