Event ID 41 is a far to general error to use in fault-finding, it is simply an unexpected shutdown error.
As already asked is your system overclocked?
have you added any extra hardware (extra USB drives/webcam/card reader etc)?
How are you dong on temperatures?
Assuming your system has started playing up for no apparent reason I would expect either failed hardware (most likely PSU) or, with our current climate - chip creep.
If you know how reseat your Memory then do the same with your CPU.
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