I also have the same problem! All browsers have this problem. I don't have a smart battery case as well. Signing in from other apps that prompt site loading such as Google sign-in will trigger the error. I find it really annoying and renders me to not be able to sign in in certain accounts and also use my browsers with ease. The browsers are also unresponsive for some reason. I already sent Apple feedback, hopefully this will get fixed ASAP?