@TP-Link I was able to reproduce the same issue many times. Used different UTP cables to exclude a broken cable, tested combinations of units #1, #2 and #3. Did a factory reset and tested again. All...

@TP-Link Both netgear switches have loop detection disabled. The problem also persist in the troubleshooting setup where I don't connect the switches, only my modem/router and 2 or 3 deco M5 units...

Deco M5 triple kit working in AP mode Normal network topology: Topology used for troubleshooting: Modem from ISP: KPN Box 12 software version: SGEJ10000448 (wifi disabled) Managed Switches: Netgear...