HELP!, I cannot access network via Wi-Fi

[davo_svk]

Since yesterday I cannot acces network via Wi-Fi on my Lumia 920 anymore.
Phone is connected to the router, but I can't access network.
I tried to restart phone (several times), do soft reset, try to connect to the another Wi-Fi... Nothing works
Internet explorer says "Error: Cannot find server or DNS error"
View attachment 111029View attachment 111030

Thank you for help.

EDIT 14:54: 3G internet doesn't work too, same error message.

 

[davo_svk]

The problem is solved. I had to reinstall OS by recovery tool.