Unable to cast to Chromecast
If the you receive a message on your TV stating your Chromecast
"Can't connect to Wi-Fi"
Locate where the Chromecast is plugged into the power strip located behind the TV.
Unplug the Chromecast cable for 10 sec, and plug it back in and wait to see if the Chromecast reconnects to the Wi-Fi.
Repeat if it does not work the first time. If the issue continues please Raise a ticket.