iPhone 12 Pro sudden problems connecting to wifi

My phone suddenly stopped connecting to my Wi-Fi after updating.

No problem with other devices. Airplay is not being recognized by my smart tv.

reset router - modem over and over.

X-finitely (hmm..what’s going on with you and Apple?)

I was sent an “upgraded” router to try.

haven’t had time to figure out setting up yet.

we need answers and no problems and interruptions like this. No time! Help us.