Android phone does not reconnect back to wifi after leaving and returning to home.

I am using an Android OPPO F1 and have set up my router recently as a wifi extender via cable. Almost everytime I leave my home and come back, my phone cannot connect back to the router. It will state 'connection denied'. However, after I restart my router, I can connect back to the router with no problems. Why is that?
This does not happen to my Windows laptop or desktop as-yet turning them on at home and they reconnect just fine.

from Android Forums at AndroidCentral.com - Ask a Question https://ift.tt/2uJKEbF
via IFTTT