I ran snapshot from just before christmas as requested by one of the driver developers, 19.07.5, and currently have gone back to 18.06.9 as it works the best. The biggest problem is the 5GHz signal isn't strong enough to penetrate into all the rooms and when on 2.4GHz the are lag spikes or disconnects. When your kid was playing nicely with 60ms pings and they jump to hundreds or thousands there is frustration.
I was able to use flent to write up reproduction steps, so if anybody wants to dig deeper they should be able to.
The big take away is the archer c7 worked fine for me needs, but I traded it for the r6220 as somebody was reporting WiFi issues with it. Since trading I now have WiFi issues and their home works fine. I seem to have narrowed it down to the 2.4GHz on the r6220, especially in newer builds.
If you are technical enough to be able to use multiple devices to run flent I'd love to see more 2.4Ghz vs. 5Ghz data added to the above report.