XB7+Pods wifi issue

Hello,

 

I have XB7 with gigabit service. When I performed speedtest, it typically gets to 300-400 mbps at a location not right by it (XB7) - which I am satisfied with it.

 

When I added Pods, at the same location where I was getting 300-400 mbps, the wifi gets even worse to less than 10 mbps. I had three pods and gateway (XB7) with pretty good separations. Then, if I plugged all pods out, then the normal speed came up again.

 

Any idea why and how I can troubleshoot this?

 

Thanks!