Why is my ds card game not working?

ok so i have the ds lite and i have this game card that contains all these games. It worked perfectly till today. It read the game finely and it started normally and it took me to the menu to pick the games. I picked the game, but then it started loading, then it froze. It keeps doing that and i turn off my ds lite, and i even clean the ds slot. I keep picking other games but it just keeps doing that.What should i do???? :O And the game card doesnt have

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