@Joseph-TP yes, I have tried all that. Other bands: 2.4 GHz is rather slow as per the old technology, 5 GHz "band 1" is fast, this is what I've been use at a daily basis because it's the only option...

@Joseph-TP maybe I didn't make myself clear, but what's happening is exactly that the fastest band is presenting this extremely slow behavior.

Is there any known issue related to this equipment? Band 2 of the 5 GHz is extremely slow a BE200 (Intel) interface is connected to this band of the router. It's been like this for almost a year and...