Sleeps, then turns off

I am have a recent and perplexing problem - when logged into my computer, after putting it to sleep myself or having the power saver put it to sleep based on my settings, the computer appears to then eventually turn itself off. Without knowing the time-window, each time the computer has gone to sleep the past week I've returned to it and discovered I've needed to turn it back on.
However, what is also strange is that I can't just hit the power button, I need to hold it down, twice, as if I'm forcing it off then turning it on. If it's actually not off when I want to wake it up, it behaves in every way as if it was off.
I have removed all peripherals, etc., but the problem persists, so no externals are causing it. The only instance when the computer sleeps as expected as when I'm logged out of it. Anyone else experience this? Any known causes or fixes?
TIA

There was never an answer to this, but the question is now irrelevant.

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hi
... i have a similar problem
but just with the sleep botton.
fist use your adapter with other iphone/itouch ... is posible itś the problem
second .. let your phone charging
...normally if we conect our phone ... after some minuts it's put on.
after 2 hours ... trate to use it ... if after it your phone continue same... could be qaa electrical/physic problem
please if you have a guaranty use it.
im sorry but my english is terrible.

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