No kidding: http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-shuts-off-intermittently-no-BSOD-or-shut-down/td-p/459785/page/134 http://forums.lenovo.c

No kidding: http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-shuts-off-intermittently-no-BSOD-or-shut-down/td-p/459785/page/134 http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-s... Already sent mine back once - mb and fan replaced, no change. Warranty service says they will replace the cpu next. Avoid the W520.