Huawei E5220 User Manual page 5

Tips
When the Mobile WiFi is in use for an extended period of
time, it will become warm and may overheat. Should this
happen, the Mobile WiFi will automatically close the
network connection and turn off to protect itself from
damage. If this occurs, place the Mobile WiFi in a well
ventilated space to allow the heat to dissipate, then turn it
on and continue to use it as normal.
If you are unable to use the Mobile WiFi as normal, try the
following:
 Consult the online help on the web management
page.
 Restart the Mobile WiFi.
Restore the Mobile WiFi to the factory settings.

Consult your operator.

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