Please take into consideration that installing or upgrading the various Intel wireless adapters by end users is not supported by Intel. Before installing this device into a system, you must contact the manufacturer of the system, and determine if the product is approved for use in a specific system in a specific country.
Furthermore, since the wireless connectivity issues were present also with the original wireless adapter, the first point of contact in this case should be Sony Support, as they may be able to provide recommendations for this specific situation and computer model.
Here are some recommendations you can try in addition to contacting OEM support:
- Check if Sony has an OEM driver version for this adapter, if they do, uninstall and delete the current version, then install the one from Sony.
- Make sure to have the most recent firmware in your Wireless router or Access Point, as well as the BIOS for your computer.
- If you use Intel PROset/Wireless software 17.13 or later, please go to the Adapter Properties in Windows Device Manager, in the Power Management tab, and make sure to enable (mark the checkbox) "Allow the computer to turn off this device to save power"
- Apply the settings from the document: What are the Recommended Settings for 802.11n Connectivity?
- Follow the recommendations from the advisory: Quick Checks That Might Improve or Fix Connection Issues