|If your computer is still under warranty, contact the OEM's support people.|
If it's not, get the model number and go to the OEM's website and look for newer drivers for your wireless interface. If there are newer drivers, download and install them and see if that doesn't fix the issue.
If there are no newere drivers, or newer ones don't fix the issue, your interface is likely experiencing a hardware failure and you'll have to replace it.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.