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Make sure that the user name or password is correct.
You have moved out of range of the network.
Turn off power management.
Other Problems
The date/time is incorrect.
Correct the date and time via the operating system or BIOS Setup
program.
After you have performed everything as described above and still have
the incorrect date and time every time you turn on the computer, the
RTC (Real-Time Clock) battery is at the end of its life. Call an authorized
dealer to replace the RTC battery.
GPS signals drop when they are not supposed to.
If your computer is connected to the docking station which has one or
more USB 3.1/3.0 devices connected, the USB 3.1/3.0 device can interfere
with the radio frequency, causing poor GPS signal reception. To solve the
problem in this situation, run the BIOS Setup Utility, go to
Advanced
Device Configuration
Docking USB Port Setting
and change the setting
to USB 2.0.