Appear to have found quite a serious bug with 5ghz WiFi support. I'm the Oreo 8.1 stable router is a sky q router which supports both 2.4 & 5ghz WiFi. Both bands share the same SSID so devices can roam between 2.4ghz & 5ghz. The Nokia 8 however has a problem, it will happily roam over to the 2.4ghz band when the 5ghz band is out of range, however once it does this, it will favour the 2.4ghz band permanently and never roam back to the 5ghz band even if you sit the phone right on top of the router. In fact it can't even see the access point on the 5ghz band. All my other android and windows devices happily roam between both bands and will prefer the 5ghz band if it's in range. Only way to get the Nokia 8 to see the 5ghz band again is to toggle WiFi on and off. Afraid the majority of users won't be tech savvy enough to even notice this, but this is not working as it should. Please look at this so you can push a fix out in the next security patch.