I noticed such a problem. If I connect to the wifi at work, then after a day's work I can not connect to the home network of the wifi. The phone sees all the networks, it tries to connect, but this all ends. The same situation if I am at home with a connected wifi for a long time and come to work, I can not connect. It helps only reboot the phone or briefly turn on / off the mobile access point. Sorry for my English.
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