Orbi RBK853 Frequent Wifi Disconnection

Hi, thanks for your reply. Apologies for the late response, I have been working away from home and have not been back for a while.

Size of my home is 799m2 (8600 square feet).

I have also explained the distance between my router and satellites below:

Distance between satellite 1 (upstairs) and router: measuring a straight line from router to satellite = less than 30 feet (backhaul status already poor). I then moved it closer = backhaul status good but still frequent disconnects. I moved it further and the backhaul status went back to poor and still disconnected. i then swapped satellites (moved satellite 2 back upstairs) but the same good/poor patterns were reproduced. Satellite 1 remains upstairs now.

ekhalil FURRYe38 thank you, I was not aware my router/satellites needed updating. When I log into my router, it says that my satellites and router are both up to date and that there are no firmware upgrades to apply? Anyhow, as recommended, I will update the FW soon when I have some time and let you know if it makes things any better.

I have an additional question FURRYe38, hopefully you have an answer for

I disabled "Enable 20/40MHz Coexistence" option in Advanced > Wireless Settings after someone had success on Netgear forums with their disconnections. I noticed that my dropouts have completely stopped in the last 4-5 days (as opposed to every 2-3 minutes).

May I ask what exactly does this do and how come this is causing the dropouts?

Also, I have noticed a speed drop when I untick this option - instead of 900mbps I am getting 700mbps at the router. And instead of getting 300-400mbps at the furthest point of my house I am now down to 150mbps. I suppose this has something to do with the option that has been disabled?

Thank you again in advance.