So, update after more emails from TP-Link support. I have had by debug firmware installed for a couple of days and got some reboots yesterday in particular, so ran the debug logs and sent them over...

Sadly after 4 or 5 days of stable connection, my router has started rebooting again. Twice today so far. Going to raise with TP Link again.

@elmiko You can try TPLink support. They were fairly responsive to me when I opened a case but they never did actually come up with a fix because the iOS 14.1 update seemed to resolve. They do have a...

@Applebe Yes, think you can change the type of security in the router control panel easily enough. Will probably generate a new password which you need to put into all your devices but not an...

@Applebe Yeah, I would be fairly confident that if your wife has an iOS14.0 device and you disconnect the WiFi from it, then you'll be fine. Then update to 14.1 and reconnect and suspect you'll still...

@dmk Have a look at this link - it may help.