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.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.