Same! I had stability problems for ages, and then after updating to a recent 5.4 build it has just been rock stable. No issues at all, and almost a month of uptime.
Thanks to everyone who made it like that 
Just tried master with firmware-5.bin_10.4-3.9.0.2-00091 and only one radio is coming up: either 2.4GHz or 5GHz. Going back to 19.07 for now.
I've been successfully using firmware-5.bin_10.4-3.10-00047 on my nbg6817 for the last couple of weeks.
I understand, but in my case I restarted wifi several times and it was very consistent. It is possible that it is because of the auto channel that I am using. I will try fixed channels next time.
I've been trying channel 'auto' on a map-ac2200/ ipq4019 (qca4019[10.4-3.6-00140] + qca4019[10.4-3.6-00140] + qca9888[10.4-3.10-00076]) for about the same time now (my nbg6817 sticks to hardcoded channels, but the map-ac2200 is used in a semi-mobile fashion, so trying out auto makes sense there), without any issues.
Did anyone file this as a bug in flyspray or on GitHub? Can’t seem to find it marked as an issue, and without that it will never be worked on I assume.
It could be. Thx for sharing that link, I missed those posts.
Yesterday I updated my R7800 to master and wifi is now working almost fine. If I change some wifi settings I then see some misbehaviour like device not coming up properly or one wifi device coming up and the other down. In that case I have to use the "wifi" command to reset all wifi devices (5GHz and 2GHz) and then both would come up ok. I also noticed these log messages which I think were not there before:
daemon.err hostapd: nl80211: kernel reports: key addition failed
From where? Many of us are constantly using master, so it hard to understand if you change is against master of last week/last month, or 19.07.x or 18.06.x...
Updated from master from a couple of weeks before.
Then it is about both the hostapd version bump, wifi driver major version bump (to kernel 5.7-rc3) and e.g. the script changes referenced above by facboy.
I'm using the imagebuilder.
Between upgrading to 19.07.3 from .2, switching back to -ct (actually the smallbuffers version, had to use non-ct a while since that at least didnt hardlock), getting rid of some uneeded packages, changing channels, and probably other small trivial settings/things, I now feel that my R7800 is ROCK SOLID, the same way my R7000 was with Xvortex. I don't know what exactly did it, but finally!
I was just recently given a free R7800 since my friend upgraded, so now I have both my R7800 in a 802.11s/BATMAN-adv mesh (backhaul and AP both on 5G),and 802.11r quick handoff. It just works! 
(Compared to just wirelessly bridging with relayd, the wireless took a little hit on the speed because of the overhead and the fact that the backhaul is on the same radio as AP. About 50/51MBs compared to about 68MBs with relayd (between hardwired NAS at one end to my wired PC on the other end, through the wireless backhaul). Incidentially the original firmware had speeds up to 75MB/s but they were fluctuating like crazy, so avg speed was probably in the 68-70MBs range, and also the connection was super unstable and actually required a manual reboot all the time, and even then it might not reconnect at first..phew. I was just gonna use the second R7800 as a wireless bridge, but ended up with Openwrt on this too since the Netgear firmware was just too bad.)
I'm writing up a bug report right now. I'm running v19.07.3 on a Linksys WRT1900ACSv2 that I compiled myself and rebooting the WiFi breaks one of the radios.
**UPDATE
Created bug report here > https://bugs.openwrt.org/index.php?do=details&task_id=3138&order=dateopened&sort=desc
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Is it possible to flash e.g. 19.07.3 straight from the factory image, or TFTP flashing necessary?
The device page mentions needing to use TFTP to switch between these 2 groups:
-
kernel 4.4 or 4.9: 17.01, old master builds (<r7000), plus the quite earliest 18.06 builds
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kernel 4.14: new master builds (>r7000), new 18.06 builds (rc2 and final 18.06.0)
But in effect I'm looking to flash to the 2nd group directly from the factory image. Is that possible?
Possible from factory image
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And it seems the fix is in master already. Will try a new build tomorrow, and see if it has resolved it.
One of my radios still does not come up even with the latest fix. Tried both auto and fixed channels.
Might be a DFS channel that needs 60 seconds to activate the 5ghz radio?!
I waited long enough. Did you have any success?