Recently polish Tp-Link contacted me and offerd to replace my Archer C9 by.... A9. It's crazy - I paid for 4core-s CPU, lot of RAM (in router), 2 USB ports (one 3.0), TimeMachine backups and more and...

Nope. After few hours router restarted again. So this is not connected with mac address and DHCP.

I found something, that makes perfect sense for me (but this is theory for now). In iOS 14 they introduced something called „privacy mac address”. It means, that every time you connect to the router...

@Kevin_Z By "investigating" you mean asking me questions via email that I already answered in this topic? And not answering to my questions how can I revert this crap router and get my money back?...

@Tudorct It's not working - tested. Same behavior, same version.

And believe me or not, but this must be software related. It's almost impossible, that so many routers are doing this in same moment.