Lost Network Connection

For some time now, our two LG TVs lose the connection overnight. Each morning it shows “Connecting” but never connects or reverts to trying to connect to the XFinity network instead of our own. I must manually turn off Wi-Fi, turn back on and select connect. When I forget the xfinity and other networks they come right back. What is happening overnight to cause the Wi-Fi connection to drop and not reconnect properly?  Very frustrating!