Stop in for a cup of coffee

That happens here once in a while. Usually need to reboot the WiFi to fix it.
That is sort of hit or miss here. When the power goes off for a little while or ATT chits out for a little while, sometimes everything hooks right back to the wifi. Other times I have to restart the TV and the laptop. I suppose there are places in their software, click to reconnect. Simply reboot usually works. A very few times I have had to re enter the password in the TV. I think those were Sony/android updates.