auto shutdown on the ds. all i do is close the screen and its off

basically as the title ses. i was playing 3rd phantom and when im either getting off the bus or going to my classes i close the screen and it shuts down automatically. is there something wrong with the r4 or the ds itself? i thought it was just that game so i checked the others and its all turning off automatically

your broken trade with friend your ds

buy a new ds

If you have the DSi, this happens occasionally. No problem at all. Just don't slam the DS that hard. If not, buy a new DS.

Get it looked at by a professional. Sleep mode (closing your DS) by normal means cannot access IPC BIT (shutdown) functions.