Hey @com_mad, I did some research on this issue and the known problems with these Toshiba Satillite laptops is a bad capacitor called NEC/TOKIN Proadlizer. You can replace the capacitor or temporarily use your computer in safe mode.
'''To replace the capacitor:'''
http://www.laptoprepairblog.net/toshiba-satellite-l300-a300-freezing-or-restarting-when-ac-power-plugged-in/
'''One of the ifixit users @oldturkey03 suggests this'''
Try this work around, until we can find a permanent fix. In SafeMode Go to control panel--> device manager---> go to processor----> disable one of the two processors --> reboot normally. Or you could try to disable your processor there. see if that will make a difference.
More techniques if none of the above work can be found here:
[post|70948]
-Let me know if this helps.