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Also, check post #2 in this thread. If your laptop is not really powering off, but is using Sleep or Hibernate mode, the power settings could be the issue.

Possibly useful link:

https://support.lenovo.com/us/en/solutions/ht117260

Check your Power settings. Make sure the WiFi adapter in the laptop is NOT set to turn off after a period of time. Note that this will drain the battery, but if you are always using it on the power...