> Hi all, my X220 has started to spontaneously shutdown, without an obvious 
> pattern.

If you're running Windows 7 you could try start/administrative 
tools/computer management and browse the logs under "event viewer" for 
errors to see if Windows somehow booted up then shut you down.

This might or might not give you accurate information.  I've been having 
spontaneous hibernates on my X201t while running, the error that gets 
reported in the logs is a depleted battery, even though when this happens my 
battery is usually at 75% and on reboot I can compute for another couple of 
hours.

David 

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