M9 suddenly unreliable
So for the last two years my Deco M9 three pack have all running mostly seamlessly. The odd reboot here and there but then that's to be a expected.
however in the last two weeks I've had persistent outages. Looking at the deco app when this happens I'll get two symptoms:
1) all three will go offline
2) the main deco will show as having no internet connection and display a red light
From here three things will happen:
1) I'll loose connectivity internally (I have a nas and it'll just drop its connection)
2) I'll lose my connection externally
3) My connection to the Mesh network will be broken and I'll lose wifi connection
Normally within 90 seconds the connection is restored. However that means anything connected by WiFi is constantly disconnecting and then reconnecting and it's infuriating.
My network map looks like this:
EE router
Main deco sits next to this and it connected by fly lead.
The second deco is upstairs and is connected by cat6. My PC is connected to this by cat6 and loses connection with everything else.
Then a third deco is linked to the second via WiFi situated in a back room.
2.4ghz and 5ghz bands are active.
Fast roaming and beamforming are disabled.
The deco's are set as AP.
The original reason for these were to provide a good strong connection for things like the Sky box, the Ring Cameras, and my Model 3, all of which have crappy reception over wifi. This far the problem was fixed, but now it's just trash dropping connections 2, 3, 4 times in an hour, then not at all for a couple hours.
at this point I just want to box them up and put them on eBay, but if I can fix the issue I'd rather they were back to the usual near flawless selves.
Help?