I just wanted to chime in and thank the OP, as this solution (going into my XFi app under the router advanced settings and changing my 2.4 GHz radio to accept b, g, and n) has also corrected the issue for me. I had a perfectly fine iPhone 8 Plus that randomly started disconnecting from my WiFi and claiming my password was wrong (it is not). Changing that radio setting solved the issue. So - THANKS OP!!!
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