I don't know what to do. I've tried to clean my DS cartridges with wipes and that doesn't seem to fix the problem and they only (sometimes) work when I blow on them and inside the 3DS/DS slot. I really hope the NS has touchscreen functionality and allows you to play DS VC games since the Wii U does. I'm worried that the NS will drop like 90% of compatibility and only NES and SNES games will be playable. I want all VC games (NES, SNES, N64, GB, GBC, GBA, and DS) to be playable on the NS. I also think they could also add Wii, Wii U, and 3DS to the mix as well. I know the Wii U, DS, and 3DS used touchscreens and the Wii used motion controls but there's no excuse for Nintendo to not let you download digital versions of Wii, Wii U, and 3DS games on the NS.