I have a profile that turns off my 12-year-olds devices at set times during the day. Over the past 6 months a few times a bunch of his devices have just disappeared from that list. It's *possible* he gets onto our phone and removes them, but I don't think so.

It seems to be mostly devices he uses less. For example if he doesn't use his Nintendo switch for a while it falls off the list.

Is this a known issue?  Is there a timeout for devices in a profile? Is there a workaround or fix?