Having run Deco M5, M9, X60 and now migrated to BE85+BE65 I'm very, very disappointed. WAN is fiber and Starlink connected via a dual-WAN Omada switch.

The main Deco BE85 (first floor) is wired directly to the BE65 in the basement (concrete floor and walls). Another BE65 on the top floor connected wirelessly shows a strong connection but still drops IoT devices and laptops. My wife's work Windows laptop loses connection intermittently, making it a pain to connect to meetings.

i bought the "flagship" BE85 to boost connectivity in my new larger house, and instead I get the opposite. 

- IoT devices: a complete pain to set up. I previously used a Guest network locked to 2.4 GHz and have now moved or tried to move 15+ IoT devices to an IoT network. Disabled MLO, Fast Roaming and Beanforming.
Devices lose connection intermittently. Devices controlling HVAC drop out causing heaters/cooling to run too long or don't start when needed.

Some devices are IMPOSSIBLE to get to connect to the IoT network.

Other devices: intermittently dropping connection, or losing Internet connection. Teams calls are unreliable as my Mac sometimes drops connection or drops speed in the basement.

When installing BE85, I set up a new SSID and connected ALL clients (except the ones that simply will not connect. I no longer have the X60 units.

I'm close to getting rid of the BE devices and going to another manufacturer.
 

What can I do to fix these issues?