Having same issues, after updating, wifi drops after phone being idle, then when I try to connect manually it tells me I entered incorrect password. Might be a coincidence but it seems to be effecting other apple products, my homepod keeps telling me it's having trouble connecting to the internet even though its in the same room as my router. Had to remove it from the home app then that led to me having to delete my entire Home because it wouldn't find my homepod after that.