Network connection fails sometimes

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WiFi

Hello all,

My sister in law lives in another city and Mrs. wife and me visit them from time to time but not very often. Her computer wifi works only sometimes.

she have told me that cell phones and other devices work flawlessly but her computer can't connect.

The icon seen in her windows 8.1 taskbar is the 5 bars with the asterisk on top signaling that some wifi networks have been found.

Time ago, just to avoid issues regarding DHCP I left a fixed IP address there just to check if that could have any effect on the issue but it looks like the problem is still there.

Shutting the computer down and waiting a while sometimes solve the issue and then she can continue working.

Yesterday I passed the updated antivirus, malwarebytes (both with no detections) and updated windows via windows update.

Today she has been able to work with the computer during the morning but not this afternoon.

The wifi card is a QUALCOMM Atheros AR9485.

I've removed the configuration that allows the OS to shut the wifi card down after a while (just in case).

And I've changed the energy plan to avoid the computer to get down after 30 minutes (but this should not be the reason as after resetting the computer the problem is still there).

I've seen somebody in the Internet recommending using the netsh winsock reset command and reset the computer when this happens, but I've still not tried it.

Can you think on another thing?

Thank you all!