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Can't connect to PC via Wi-Fi

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Can't connect to PC via Wi-Fi

Few days ago I connected my Z3c to PC via Wi-Fi and it worked correctly. Sometimes the connection dropped but then connected again without a problem.

But after I had to reboot my phone, the connection with PC couldn't be established any more. I tried to reboot both PC and phone, uninstall and reinstall PC Companion, delete the connection from Xperia Connections in the phone and configure it from the very beginning, tried even to reboot the Wi-Fi router — nothing worked. The network is working in 5GHz (both on PC and phone) and when a start the procedure of connection, it starts in PC Companion as if the phone is detected, but nothing happens and I get the message "Can't connect to PC" on the phone. Please help! I don't want to use other programs, because I have no root and can access SD card only with standard apps.