I have a few iOS devices and every few days one of them just forget my wifi network. It's not that it fails to connect it actually forgets the network and i have to manually add it back.

I've had this problem for a few years but now it seems to occur regularly every week or so, since getting a new iPhone.

It's not an iPhone setting, auto join is enabled etc. All my guest SSID still show up under My Network in the iOS wifi settings it's just my main wifi that deletes itself every few days.

It's not a conflict between SSIDs as my other iOS devices are setup on a single SSID. This does not occur to any laptop or Android devices.

The only real difference between my main SSID and others is that my main SSID is hidden, anyone know if iOS devices do not like hidden networks?