Improper Settings, check the phone Settings: open ' wlan' Click the menu to select \"Advanced\
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Housekeeping software causes: This type of housekeeping software is installed and the power saving mode is set. As long as the standby state automatically disconnect wifi cancel. If you do not know how to cancel the butler software, the easiest way is to \"disable\" the mobile phone butler software in the application first. When used, line \"Enable\" again.