I gather that there's a newer one, though I haven't fired up the Deco yet to be sure of that. I'm on the same one you describe, I verified that a few days ago.

Terrific, thanks guys! I'll try the firmware update first in case that does fix the problem then give AP mode a shot.

Oh wow, glad I didn't have a chance to do any more troubleshooting! This post is validating, @SpiderLAN, it suggests that there really isn't anything I can do at the moment, the TPL engineers need to...

Thanks for the additional ideas, @Riley_S! That's really interesting re: the DNS, now I'm remembering the whole '1.1.1.1' thing that appeared a few years ago, I think I set that on whatever router I...

Thanks for the suggestions, @Riley_S, but I'm afraid that didn't get me anywhere. I set the QoS to 1024 up and down (the max allowed, and my network occasionally does hit that mark) and chose my MBP...

TL/DR: This supposedly "1800 Mbps" router can't break 250 Mpbs; the Netgear router it's meant to replace runs circles around it. What gives? --- I bought a used Deco X20 this week, hoping to replace...