This is frustrating. I bought a new Dell M4300, and it reboots at inopportune times:

• when going from the power supply from the factory to a 65-watt power supply from a different Dell computer after closing lid for suspend mode
• when plugging into the docking station when the power was off (power strip switch was accidentally clicked off)

If I leave it on, it does not reboot in conditions in the first bullet. With the old Dell Inspiron8200, you had to always turn off when docking or undocking. I've gotten to the point where I double-check saving everything before closing it into suspend mode. Even so, open IE pages close, book marks are lost, etc.