Home wifi does not work - 15.04 Lenovo Z510

Question

After I upgrade to 15.04 from 14.04 (though not immediately after I updated), my home internet did not work anymore. It connected, but when I tried to go to a webpage an error is given by the browser. This error is:

dns probe finished bad config

Only my home internet does not work. However it does work on every other device I have.

I tried what they said here but that did not help. Some information:

kernel: 4.0.3-040003-generic

boudewijn@boudewijn-Lenovo-IdeaPad-Z510:~$ lspci

09:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)

boudewijn@boudewijn-Lenovo-IdeaPad-Z510:~$ rfkill list
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: ideapad_wlan: Wireless LAN
    Soft blocked: no
    Hard blocked: no
2: ideapad_bluetooth: Bluetooth
    Soft blocked: yes
    Hard blocked: no
3: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no

I hope someone can help me! :)