Unplugging power cord stops Windows?

Hi,
When I unplug the power cord (when the machine is in a port replicator) Windows stops responding. Does anyone know what can cause this and how to resolve the problem?
Regards,
Allan Kjaer

machine model? xxxx-xxx? w500, w510, w70x?
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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