Wifi has randomly been disconnecting from my home network (I only have 5ghz on) on this beta.
Then, this morning I got the bug where it said my WiFi password was incorrect and could not connect to the network. Tried toggling airplane mode, forgot the network and tried to re-join, restarted my phone, hard reset my phone, reset my router. None worked. I then reset my network settings and that finally worked.
However, I then found out my wife couldn’t connect either and the exact same thing was happening, but she’s on 11.2.6.
Obviously this has something to do with how my router talks to iOS 11, as I never had this issue previously. Weird that resetting the router didn’t fix it though.
I’ve seen many posts about this kinda WiFi issue specifically involving 5ghz.
Out of curiosity, what router do you use?
I may have a solution, as I have had similar issues previously, but it is router specific.