Since I got my newish phone (iphone 11 vs old 6), I've been getting regularly banned on it when in a nearby city, where I am for 10 days a month. I get the message that I've been banned for being rude, whether logged on as a guest or under regular user name. I can sometimes get in by clearing cookies, and when this does work, it can work for days or only until I change threads. Totally unpredictable and super annoying.
Everything is fine on my phone at home.