Hi @David-TP, thanks for your help. I checked your TP-Link ID, I notice the current firmware of your Deco M9 plus is still 1.2.11. The latest firmware now is 1.6.4. Thanks, did not know. I do check...

My home is about 25 meter long with multiple thick, brick walls in between. Signal going up is less of a problem due to wooden floors, no concrete. Fiber optic cable enters at the front of the house....