This ^^^^^^^ This really is the best solution: Have an emergency SSID which is turned off by default, and have all the devices provisioned with this SSID also This allows you, in the event of a device falling off the network, to bring up the SSID, allowing the device to (probably after a reboot) to join the network. But, this is not fixing the issue. You really do need to find out why devices are falling off the network and failing to rejoin One last, left field, solution, is something called Autonomous Single App ? Kiosk mode: This firstly needs support from the application developer (which is INCREDIBLY simple to build in) and allows you to *tell* the app to go into kiosk mode, rather than the device going into kiosk mode with the app: There's a difference. It allows the app to go into kiosk mode itself. It also, via a hidden menu or whatever, allow the app to come out of kiosk mode. You get all the benefits of Kiosk Mode without having bricked devices
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