DS Shutting off when closed?

hey, I have a DS lite and I'm playing phoenix wright (3) and the last few times i've shut my DS it has turned off/frozen. I just want to know if anyone else has ever had this problem? Do you think its the game? DS? (i don't have time to check with another game)

I have never had this problem bfore and i have a dslite also. Mine just goes to sleep. Maybe theres a glitch in the DS.

same happened to me the other day

it magically turned off when I wasn't playing with it in sleep mode

I've seen it commonly happen to mine and my friends also. If its that big of a deal I would by a new one; That is if you have the money.

Its happened to me once or twice. I fancy is the wiring or the DS card comes loose ever so slightly, casuing it to do that.