@emjhay Probably not much help from me but Factory Reset the Deco 2 and reconfigure; use Cat 5e cables on all the Deco units if you're connecting via Ethernet. (Cat5e will still support Gigabit...

@marlu I've set up static/fixed IP addresses for all my clients (about 38) around the house from my ASUS Router. It's a long process I agree but its a one-time effort.After that I only have to add...

I've done QoS on my network from my ASUS RT-AC3200 Router: prioritising and bandwidth limiting, as opposed from my Deco M5. Ostensibly I only bought the Deco M5 to serve as a mesh WiFi and nothing...