I've had the Deco P9 (3 set) since November 9th 2020.

When it is working, it works well. However, one of the P9 (the one in my home office) units keeps disconnecting once or twice per day. The backhaul never shows connected via powerline (only wifi), which is the reason why I bought the P9s in the first place.

On day 1, when I first set up the P9s, I had intermitent backhaul connectivity via powerline. In some cases it showed both powerline and wifi (via the Deco mobile app) which was weird. This powerline connectivity didn't last long. A month after I bought the P9s, whenever I check backhaul connectivity since, it always shows only wifi. And this wifi connection seems to be unstable.

The WiFi backhaul connectivity isn't great either. And it seems to keep dropping. The Decos are each on their own floor: floor 1, floor 2, floor 3.

This is extremely annoying. However I can no longer return this system, as I'm past the return date. What should I do now? Call it quits, swallow my pride, and get a proper working mesh WiFi system? Or is there a solution for these problems?