Ring Stick-up cam enters set up mode automatically after being disconnected from the network

I have some cameras that had disconnected from my network (I stopped broadcasting the network SSID for a period of time). When I retrieved the cameras the next day (approx. 16 hours later) they were broadcasting a network with their name (i.e. Ring Setup 5J). I did not press the yellow button to make the cameras enter set-up mode. It doesn’t seem normal that the camera would enter set-up mode on its own after being disconnected. Additionally, is there a security issue with this as the wifi-network the camera was broadcasting was unsecure (could someone connect to the camera and install some malware or some variant of that?). If I had not retrieved the cameras they would have been broadcasting that signal for quite some time…Any help or thoughts would be appreciated.Thanks!