Deco X20 3 pack going offline, restarting and going offline, also ethernet backhaul dropping
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The subject says it all. The main unit is more stable but the other two go offline all the time. Sometimes they reset, other times not. The ethernet backhaul comes and goes. Right now, they are both offline and I am sick of restarting them. While I have been typing, they have come back but my ethernet backhaul hasn't
What you described could happen if switch(es) at your home network through which Deco units are connected do not support Deco Ethernet backhaul protocol. This could make Deco unstable. DLink switches are known to cause such issues.
See this FAQ document for more information: General questions about Ethernet Backhaul feature on your Deco
For troubleshooting purposes I would suggest connecting all Deco units to each other with Ethernet cables, without switches between them:
You may need to move Satellite Deco units closer to where Main Deco for that, but once again: this is temporary reconfiguration of you Deco mesh.
If in that daisy chain your Deco mesh becomes stable, that strongly hints at switches or Ethernet wiring at your place. It should be easier to pinpoint the culprit now.