Hello,

I am experiencing a recurring issue with my TP-Link network environment.

Current topology:
ISP Modem 1 + ISP Modem 2
-> TP-Link ER7206 Load Balancer Router
-> TP-Link Deco X50 Mesh (Access Point mode)
-> 2 Secondary Deco X50 units

ER7206 information:
Model: TL-ER7206 v1.0
Firmware: 1.4.3 Build 20251027 Rel.82388

Deco information:
Model: Deco X50
Firmware: 1.3.1 Build 20251122 Rel.36074
Operating Mode: Access Point (AP)

Problem description:
For the last 7 consecutive days, during the night or early morning, the Deco network loses Internet connectivity.

Symptoms observed:
The Main Deco becomes offline with solid red LED.
Deco WiFi network remains available
Clients can still connect to WiFi. (no internet connection).
Devices behind Deco lose Internet access completely.
Clients connected to Deco can still ping the ER7206 successfully. However, the ER7206 web management interface becomes inaccessible from any device on the network.
Some wired devices connected directly to the ER7206 or switch may continue working partially (random).

Important:
The issue persists even after replacing the original Main Deco with another Deco unit. (i first suspected a DECO problem)

I already replaced:
Deco main unit replacement
Ethernet cable
ER7206 LAN port

I tested:
Hardware reset of both deco units that have been tested as primary
Direct connection from Deco to ER7206
Connection through a switch

The problem still occurs exactly the same way.

The ONLY workaround that restores service is:
Physically disconnecting power from the ER7206 for about 20 seconds and powering it back on.

After reboot, the router works normally again. Unfortunately, logs only show entries after reboot, so I cannot see what happened before the issue occurred.

Could you please advise if this is a known issue,and if is there any available solution for addressing this behavior?

Thank you.