@TP-Link hi It was the whole mesh system. yes, under wireless router mode. No, it doesn't seem to come back until powered down, I also tried updating firmware and the reboot didn't bring the speed...

When testing the ISP speed I get in excess of 200mbps. When I test using google or Ookla I get about 30mbps. I turned all Deco's off by cutting the power and then turned them all back on and I got...