If it's a DS Lite, it's bound to do that, because that's exactly want happened with mine. Luckily, it was during the guarantee period, so therefore I just told the manufacturer to replace it and I got a new one in less than a week.
HI
Sorry to say this but this is a common prob
Check the case very closely
You will prob find a hairline crack
The only real fix is a new case/shell
and they aint easy to fit
p.s Its the right hinge that will have the crack near it