@Joseph-TP The version is Archer BE550 v1.0 . I am on the last firmware, i tried all settings you have said and everything is the same. The strange thing is that when i try speed test the ping is...

@Joseph-TP Hello, i have the same problem. When i play 4k movies and sometimes iptv the is so much buffering even with the last firmware and my tv is 2m from the router. My deco s7 works way better...