@MikkelDK Were you able to confirm that it was the relaying process that is the culprit by the method I suggested? Until you’ve eliminated other variables it could still be something wrong with the...

@MikkelDK Ok, to be clear here: As you suspected, the speed test in the Deco app runs from the Master Deco , not from the Phone. This implies that the slowdown is occurring in the relay process...

@TalTik Just to make it clear - as has been stated in this thread a few times, the Deco system supports WPA2 (AES) and always has. The issue is that you cannot turn off the support for WPA (TKIP)....

@TP-Link_Deco A very useful way to address this would be to provide a way to have a default filtering category for new devices (before another is assigned). This would enable a secure by default, and...

@Jannek999 From the website photos there are 2 Ethernet ports on the M9, like the M5. In which case you probably have the MAC address from the other one. Swap the cable over and see if that works....

At this point I suggest you go to the web interface (on the IP address of the main Deco) and go to Advanced -> System -> System log. Read through the entries from around the time of the reboot and...