Since upgrading my 4 x M5's to version 1.5.1 my mesh network has now become very unreliable as My access points are no longer connecting to the nearest access point but to the master.

I understand there is no ability to downgrade my M5's down to version 1.4.x so when is M9's been upgraded to version 1.5

the only other option I have is to remove the M9's as the network speeds have reduced from 200Mbps to around 30Mbps at my edge devices.