I have a 3 unit Amazon eero Pro 6 mesh Wi-Fi 6 system. This is on a Cox Gigabit service that consistently provides 930Mbs service (via the built-in Eero speedtest.)

I get 400 to 600Mbs WI-FI speed at my Echo Show 8 And Echo Show 10.

My brother has as Echo Show 8 gen 1.

When I Drop-in or call my brother's Echo show 8, the call starts off providing real-time responsiveness, but shortly into the call, we start getting latency on the video, as the call goes on, the latency increases. This goes on until the video is 15 to 30 seconds behind the audio.

We have rebooted the network, after waiting for 60 seconds (per Amazon support), and the latency is minimized, but then slowly increase again..

My brother's daughters Drop-in on him often, they do not have these issues.

I have Dropped-in on my brother's Echoshow via  Alexa on my cell phone while driving around and the video Latency never occurs.

I have turned on the Echo labs, video conferencing setting, the first Drop-in that we had, after turning this setting on, did have the latency during the call.

Does anyone have any ideas on what settings I should/could change to try to fix this?