In case the wifi gets switched off due to some reason - tapo cameras c100/ c200 will not auto re-connect to the same (known) wifi, where it was registered. Manual reset is difficult as the cameras are mounted high. Even it that is done - I have seen for 6 separate devices, they are unable to find the known wifi. Even after re-scan or manually enterning the wifi name/ password the devices dont reconnect. I have spoken to tech team who gives wired solutions like unistall/ reinstall ->relog in the Tapo app.But finally they accepted many devices have connectivity issue. 

Network connected to is 2.4GhZ.