Verified answer

It might be the type of ds it is or maybe the game is messed up.

You've probably been playing too long.

If it happens after you play for 10 minutes,give it a couple days.

the game cartdrige is messed up try blowing on the insert for the game

take it back to the shop u got it frm nd they'll repair it or give ya another 1

try wiping it with a dry towel