MacBook Pro suddenly restarts

hi folks,

ever since bought , downloaded os x lion i've been having annoying problem mbp. thing computer without no warning restarts, happens few times day in no particular pattern, when browse web, using word, drawing in photoshop or playing games. mac 1 year old i've never had other problems it.

happens: screen freezes - grey screen appear - few seconds later apple logo appear - background appear , programs restarts , work deleted.

 

is "restart when computer freezes" checked?

 

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