Why does my laptop screen randomly flash when it is unplugged from the wall charger?

Meep

New member
My Toshiba laptop will flash every so often when I am using it while it's unplugged. The flash covers the entire screen and I don't know what it is flashing. It might be an image but I cannot tell. Has anyone every experienced this before? Is this some sort of virus? By the way this has never happened while it is plugged in.
 
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