I managed to solve all my issues, I switched to a Netgear Nighthawk, sending the TP AX11000 back :(

@shaywood Speaking to them now. Not installed the beta as I think from reading this, it has the same problems. The settings I posted do seem to work for me, but smart connect is a feature this has...

I would like to be added to the list of this problem. I have managed to make it daily or bi-daily stable with shipped firmware with the following. However now, rather than drop the 2.4 band, I get...