Nokia’s N8 is one of the most high-profiled phone from Nokia in the recent times and the company has said that some of the N8 phones are sold with a power fault (i.e. phones will keep switching off on its own).

Nokia sales chief Niklas Savander said “a limited number of N8 users” were facing the problem of their phones switching off, and they are not able to turn them on again.
A spokesman said the fault was due to a problem in production, which has since been fixed.
The fault in the power management stems from the way in which the engine component — which includes most of the technology in the phone, excluding covers and batteries — in the Nokia N8 was being installed.[source].
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We have also faced some issues with Nokia N8, specifically in the past 1 month of usage, phone switched off 5-6 times on its own. Expect a much detailed review of the phone in the coming days.