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Reset your network connections and see if that works. Go to settings, connections, wifi, top right three dot menu select advance, wifi control history and see if an app is doing it. While there in that menu turn off wifi power saving mode. If it still persists then there's prolly too much traffic on that gate way and you should go to the routers main page and see
I found out that when I take out my sim card my wifi works fine but when I use a different sim cards It's disconnecting and reconnecting constantly I think it's my phone
Who's your carrier? I bet there preloaded or app is the culprit. Let me know which one and I'll walk you through getting it to stop. It's pretty easy
Dev ops open? If so go turn on mobile data always on. Turn off wifi power saving mode, turn on wifi throttling. Check the control history and see if there is an app to blame. Otherwise just go to the permissions for wifi control in the special access and turn them all off and see if it still is happening.