Wifi Keeps Dropping

Our home internet wifi keeps dropping quite frequently across iPhone and laptop. Basic web pages having mostly text struggle to load, and short-form videos too, and it often takes several refreshes before it can work. Almost every video call is choppy, pixelated, and the other receiving end cannot piece together what I am saying or doing because of the poor connectivity quality. I have tried replugging in the modem, turning the wifi on and off, and reloading the page. Nothing fixes the issues. Please help, this is extremely disruptive to daily use.