W540 laptop with Windows 7, has given client problems with SSD failures. Now the laptop is getting slower and random OS problems are occuring. The current SSD is a 500GB Samsung EVO 850. Firmware is current according to Magician, and only POR count is notable, but drive is showing in Good condition (Installed 1/27/17). Yesterday the client attempted to reboot and the laptop shuts down... Or so it seems, since they cannot turn power back on! The fan is still running, and it seems hot. The power indicators have all turned off. It is connected to a dock, and no I have not tested off the dock. Since the problem started, it is 5 for 5 on this reboot problem. Holding the power button in for 5 seconds does kill the power, and allow the laptop to start. A shutdown works properly. Running Norton Security for AV. End user reports no changes were made recently to the laptop in terms of software. No Windows updates were installed in the last 2 weeks. The laptop is shut off every night. Everything works great on the dock in the office. The only recent issues have been with off line (CSC) of mapped drive (Only user to share). Able to repair when he returns to office, and it doesn't happen often when he is on the road. I did run SFC and CHKDSK last night on the laptop.