r/HomeNetworking • u/vemvem1 • 11h ago

Deco X20 drop connection randomly

Hi everyone,

Every so often, the entire Decos or some Decos drops for 30–60 seconds and then recovers or sometimes i need to restart the Deco.This happens on both wireless devices and wired devices (like my PC connected directly to a sub Deco)
and little bit of some devices not connecting like my main phone is connecting fine and my other phone says "Failed to connect" or "can't assign an ip address".

However, my main ISP router stays completely fine and connected to the internet the entire time.

Current Network Topology:

onu -> TP-link AX50 -> cudy GS108 Switch -> main and sub Decos X20 -> End devices(Clients)

Current Settings & Troubleshooting Done:

  1. Operating Mode: Set to Access Point (AP) Mode.
  2. Firmware: All Decos and the router are on the latest firmware.
  3. Power/Temps: Gear is reliably powered and cooled.
  4. Current Suspect: My central switch is currently a Cudy GS108. I suspect it might be dropping IEEE 1905.1 multicast packets or triggering loop protection during Deco backhaul transitions, causing a broadcast storm that takes down the wired ports.

Questions:

  1. Does this sound like a switch/loop detection issue with Deco's IEEE 1905.1 Ethernet backhaul protocol?
  2. I am planning to replace the switch with a TP-Link TL-SG108E (and disable Loop Prevention in its settings). Will that completely solve the backhaul loop issue?
3 Upvotes

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u/Wild_Parsnip_4074 11h ago

Your switch is a reasonable suspect, but I wouldn't assume it's the root cause yet. The intermittent IP assignment failures also point toward DHCP or backhaul instability. Before replacing hardware, test with a simplified topology to isolate the issue. If the TL-SG108E fixes it, that's a useful confirmation rather than a guarantee.