Same here. Sometimes pages won't load, or load very, very slowly, even though my Wifi is up and running strong. I'm also having wake from sleep issues since updating.Not just me!
My launch 13 PM - ever since iOS 16 came out - noticed that wifi sometimes drops out. It will just refuse to load anything in any app - and my phone tells me I don't have internet. I turn off WiFi and everything works perfectly. And I have WiFi assist on! Usually turning on WiFi works but sometimes I have to wait awhile for WiFi to kick back in.
Pre iOS 16 - WiFi was perfect on this device. Happens once or twice every other day.