Hi Why is my M4 capped to 250Mbps in router mode? It works perfect at 1000Mbps with the ISP router. I don't want to use the M4 in AP mode. My firmware is up to date

I have a 1000mb line. The main m4 deco tops out at 250Mbps. When i use the ISP router then i get the full 1000Mbps. No QOS devices I'm using cat6E. Tried removing the satellites, direct cable into...