As well as checking your phone's Wi-Fi connection settings also please check your Home Broadband Routers Settings.
If your not on a decent amount of Mobile Data Gb of data plan then turn Mobile Data Off in your phone's settings to stop any unwanted usage if Wi-Fi fails.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.