I had the same exact issues and the only thing that fixed it was swapping out routers. I couldn’t finish a single activity, constantly booted and it just suddenly started doing that. I tried every single step you have listed plus contacting the router manufacturer and nothing worked. Luckily I had another router and swapped them out and I haven’t had a single problem since. Just sharing suggestions.
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Thanks for the feedback. This game is just the only problem I have with it lol I bought another router earlier, should be here tomorrow. So hopefully this will resolve my issues as well!