Extreme sensitivity to obsctruction on 5Ghz

Chateau AX Pro with the latest test firmware here. When close to router with visible proximity (without obsctructions), WiFi clients have excellent connection without packet loss. Once behind just about any wall and 10 meter distance from router, WiFi clients experience high latency spikes and packet loss every 20 seconds or so. This is with default settings.

ISP router and other routers never had this issue when located in the same exact spot as Chateau AX Pro. How do I resolve this? Is this a hardware issue or are default settings set to be overly sensitive? What settings can I change get rid mentioned spikes and packet loss behind walls? Again, other routers did not have this issue behind the same walls and at same distance.