I see. If it continues to act up, download the Intel wireless adapter driver from asus's website for your model:
https://dlcdnets.asus.com/pub/ASUS/nb/Image/Dri...
Install it and see if that helps with the issue.
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Further more, you can also download and install BIOS (which is the firmware of the motherboard in case the issue has to do with motherboard where the wifi card is seated). https://dlcdnets.asus.com/pub/ASUS/nb/Image/BIO...
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If it still happens intermittently, and you've done the above, the issue can be hardware related, such as loose connection of the card. In that case, you need to seek Asus's support instead.
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By the way, the FN key issue is all good?