Looking thru this forum this question has come up a few times. Unfortunately there isn't any remove way to get the cameras to reboot. However some people put their cameras on smart home switches so they can turn the power to the camera on and off that way. So short of that can you have someone go over and unplug the power to the cameras for about a minute and then plug them back in? The other this is to power cycle the Internet Router and WIFI but of course that requires someone be there as well.
Sorry I don't have a better answer.
