Your WIFI router may receive many interference from your neighborhood and these interference change day by day.
To have the best performance from time to time your WIFI router need to be re-configured by channel by boosted TX power sometimes by elevated the TX priority.
WIFI Router Booster(Pro) is the only APP in Google Play that can boost WIFI router automatically.

This APP will boost WIFI routers by:
ANALYSIS
-- best Channels
AUTO CONFIGURE:
-- channel
-- power
-- priority
-- and so on.

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How to use:
Check on the related checkboxs: choose to ask for channel recommendations only or to auto-configure all router parameters.
Click the boost button you may need to re-click the boost button again when the wireless environment changed several days later.