Installed the Deco X20 3 pack mesh system and one phone is having issues switching between decos. When it gets too far away from the one it is connected to it tries to connect to the other closer Deco and says it has an authentication error on the phone wifi connection screen. The phone must then be rebooted and works as long as it stays near one deco. Although sometimes it does lose the connection, doesn't show an error, and must be rebooted for the internet to work again.

I tried turning on fast roaming and the problem remains.

Another cell phone has no issues switching between decos. The other phone is a OnePlus 8t connected on the 2.4ghz band. The S6 does not tell me what it was connecting via.