Hi everyone,

I'm experiencing a recurring issue with my TP-Link Deco M4R(2.0) mesh router system, and I’m hoping someone here has encountered the same and found a reliable solution.

📌 Problem Summary

• My Deco M4R randomly loses internet connectivity.

• The LAN and Wi-Fi stay active – devices can still connect and receive IP addresses.

• However, the internet goes down, and Deco does not automatically recover.

• The only way to restore connection is by manually rebooting the main Deco unit (power cycle).

⚙️ My Configuration

• Model: Deco M4R(2.0)

• Firmware: 1.6.5 Build 20241231 Rel. 41802

• Mode: Router

• Configuration: ISP modem  (Fiber twist p2420) -> Main Deco M4 (router mode) - Ethernet backhaul -> Satelite deco M4

• WAN connection type: Static IP (set manually ~2 weeks ago didn't help), ISP recommends Dynamic IP

• DNS: Manual (8.8.8.8 / 1.1.1.1) 

• IPTV/VLAN: Disabled

• MAC Cloning: Enabled (matches working device)

• WAN Port setting: Not available on my model

• Multicast/IGMP Proxy: Enabled by default, cannot disable

🕵️‍♂️ What I’ve Tried / Observed

• Internet from the ISP modem is fully functional — tested with laptop directly.

• I have tried:

  • different Ethernet cables,

  • both Deco Ethernet ports,

  • switching to Access Point mode,

  • static and dynamic IP on WAN,

  • DNS and MAC clone settings.

  • Swap decos units betwen main and satelite

• Logs show:

  • frequent WAN link loss (br-wan) even with static IP,

  • Deco does not reinitiate WAN link or reconnect,

  • repeated errors like send ioctl failed, improxy multicast group failure,

  • WAN status goes from ONLINE → OFFLINE → ONLINE, but no traffic is restored unless rebooted.

💡 Additional Notes

• That suggests either:

  • hardware issue with primary WAN port, or

  • firmware logic failing to reinitialize the WAN interface properly after loss.

❓ Looking for Help

Has anyone else:

• Faced WAN link or DHCP issues like this with Deco M4R?

• Found a way to force WAN renewal/reconnect without full reboot?

• Managed to disable multicast proxy (improxy) or confirmed it as a cause?

I’ve already contacted TP-Link support, but would appreciate feedback from you too.

Thanks in advance!