G 780 - Wifi limited on Windows 8.1

Hi.
Since I installed the update of Windows 8.1 (which I really regret) , I have problems with my wifi connection. It turns to limited regularly, sometimes every 30 seconds.
I tried a lot of solutions I found on the internet and no success.
Thank you.

hi muskarulz,
Welcome to Lenovo Community Forums!
"Given that you have already did a Router modem Power cycle and still the same results and you have a working LAN connection to download some drivers"
1.
Open System Properties and go to Advanced System Settings
Then this
Spoiler (Highlight to read)
Now on the options
do this
Spoiler (Highlight to read)
2.
Open Device Manager
Uninstall all Wireless driver
If ever it prompt you "delete driver software of this device" place a check then go ahead and un install it.
Restart your system if prompted
3.
Now download the driver based on you Wificard model
Intel Wireless LAN Driver
Wireless LAN Driver (Liteon/Atheros, CyberTan/Broadcom)
run the Downloaded file and just go ahead with it till it finishes the installation.
4. Open device Manager / Under Network Adapter, right click on your Broadcom and select update driver
Now on the pop up window select "Browse my computer for driver software
Then select "Let me pick from a list"
You will be provided with a list of driver
From here if the list indicates a date for the drivers choose the most recent then install it
and reconnect to your WIFI it will say Limited in few seconds the it will connect.
it shoud work!!
If the list does not have dates on it you will have to do a trial and error with the drivers, select one and try connecting
again give few second when it say limitied.
If it stays that way Repeat Step 4. and try other driver.
Please Let me know your findings
Cheers!
Solid Cruver
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--------------------------------------EDIT----------------------------------------
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