Been having this issue since the last update. Fully up to date galaxy s7 edge on the three network in the UK.
No matter what I have tried from completely uninstalling all my avast products and re installing whenever I try to scan a wifi network it fails after about two seconds. I have tried several different wifi networks with different routers but it continues to fail. I've seen a few mentions of this in the forum but can't find a resolution even after trying some of the advice like stopping smart switch.
Any hell would be much appreciated and any info you need let me know.