Problems with new eero 6 5ghz wifi

[jon1967]

Hi compatible  devices are connecting at 5ghz channel 155 despite it being  congested and weak signal and quickly drop to unuseable speeds

They wont reconnect at 2.4 automatically despite signal being quite reasonable

I presume this is related to other issue with this router

Please can i have an eero 6 pro if this is expected to resolve

Thanks