Hmm no such issues for mine and my friend set, we did not even reset anything after the update it just works as before.
What's your settings under adaptive Wi-Fi?
This is just an update to this post and whoever reading this and facing the same issue i hope this helps.
I called samsung service center and the guy on the line confirmed that after the oreo update there were 3 bugs in them and they were intermittent Wi-Fi, intermittent bluetooth and Iris scanner automatically starting up on lock screen. they are working on pushing the updates out batch by batch for they had sent out a beta version of Oreo instead of the actual one by mistake. all fixes to this has already been made in Oreo 8.1 and we received 8.0 and that too beta version of it.
the steps i took before calling the call center on my own were,
1. forget the wifi network and reconnect,
2. wipe system cache,
3. reset all network setting,
4. factory reset.
even after that the wifi and iris scanner issue still persists for me. so for those who wanna factory reset do not bother as it wont work and an update is being pushed out for fixes in the bug batch by batch to all s8, s8 plus and note 8 devices that are affected.
the guy on the line said if after even receiving all updates and updating them your issue still persist that means the beta update screw the phone up and you'd have to bring it down to either westgate or plaza sing service center to get your motherboard changed.
The samsung call center guy was pretty helpful. god bless him. im just waiting for my update now as i havent got it but based on when i purchased my note 8 which was november 2017 he said it should be coming soon.
hope this helped anyone facing the same issue. cheers.
