@Radiotot,

So your wife is looking at the camera feeds via the local wi-fi connection. Your camera feeds have to leave your network, pass through AWS servers, and then to your phone.

If your wife disconnects from the Wi-Fi network at your home, is she able to view the camera feeds?

You may have your wife simply reboot the cameras to see if it was just the cameras that had lost their cloud connection. Otherwise, it is likely that the traffic is being either blocked by your router or parental controls. If these are on an IoT network, your activity may for some reason be blocked due to suspicious activity by mistake.

One thing that is easy to change, is your DNS server. Changing this will, at the very least cause your traffic to pass through a different route and server once it leaves your network. I would also check your connection, can you view the cameras via your mobile connection rather than Wi-Fi? Do you happen to have any data saver settings on your phone set? Do you have a VPN set on your phone?