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Why is it crashing so often?

I'll boot it up, it'll run fine, and then the screen will go black and either completely shut-down, or start backup again.

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crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
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