Devices disconnecting from Orbi RBS350

Equipment: Orbi RBS350 mesh, 1 Router and 2 Satellites. Running in AP mode. Connected to the internet via a BT Smarthub

Firmware: V4.4.0.10_2.10.63

Issue: 1 of the Orbi satellites is positioned in a garden room approximately 50mtrs from the main Orbi router and connected back to it via armoured Cat6.

I have a Ring security camera and 2 x IOT light switches in the garden room, all of which connect on 2.4Ghz (Channel 6). These devices keep disconnecting from the Wi-Fi periodically, sometimes after a few hours and sometimes after a few days.

In order to reconnect them, I have to switch the Orbi satellite off or reboot the whole mesh.

Any help or advice is much appreciated...