Wifi router blocks access after some time.

So i have router lynksys WRT120N  and the latest 1.0.0.7 firmware. And the problem occured frequently. I'll explain for example what happened yesterday. 
At about 13.00 i went out, wifi was working okay. At around 18.00 i returned home and i was trying to connect to the wifi with my android phone, and suprisingly it did not work. I tried on my laptop and on a android tablet. It did not work. The only thing that i could figure it out is to reset the router. I checked the settings, and there was no access policy e.g. time based access blocking. 
any ideas?
cheers

You're welcome.

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