@Sunshine by wire through the router the speed is 970 mbs, by wi-fi in the properties it shows 870mbs and the speedtest speed is not higher than 250 mbs at 5 GHz

I purchased an Archer c5 pro router. At home, I connected 1 Gbps optics. The router is configured in 2 bands 2.4 and 5. Wi-Fi internet speed of 5GHz +-250mbs. What is the reason that the router cuts...