Hi when i play a Game on my Ds it works fine for a while and all of a sudden the both screens go blanck

Try getting a new version or update your ds!

update r4

go to the place you got it and tell them what happen

There might be something (dirt or dust) blocking up the ds card slot. So try blowing on the card and in the game slot.

recalibrate the touch screen.

ur game reader inside of ur DS is dirty or faulty. First try blowing air into it, is that doesnt solve it, im afraid youu'll have to take it to nintendo, they'll fix it up for a fee.

Umm i think you can manually add it on check on youtube or Google or ask me personally :]

If both went at the exact same time, each has it's own connection with a different ribbon cable in a different area, it would tend to imply that the ribbon cables and screens are both working fine and that the problem is elsewhere.

Do you know anyone else who has a nintendo ds (doesn't have to be lite)? If so, try the game in that sytstem, and if the same thing happens, then the game has a glitch. This tends to happen a lot with plenty of my handheld games, and i find that it helps if you blow into the game cartridge, and also into the cartridge hole. If that doesn't work, try repeatedly turning the game on and off. And if that doesn't work, try going to nintendo.com.

You're going to have to send it in for repair. It sounds like it's out of warranty, which is unfortunate.