First of all, thanks to all the hard work of you devs!
I've got 3x D-Link DIR-825 routers that have been running OpenWrt rock-solidly since Barrier Breaker.
A couple of months ago, I started running 19.07.x (x=1,2 and 3) - the ath79 flavor. For example: openwrt-19.07.3-ath79-generic-dlink_dir-825-c1-squashfs-sysupgrade.bin
I have upgraded both with and without a reset. No matter what I do the these have all been unstable: lots of WiFi problems and also WLAN interruptions. I have had to restart many times. (Since OpenWrt has always been so reliable, I assumed the problem was elsewhere.)
Eventually I reverted to ar71xxx: openwrt-19.07.3-ar71xx-generic-dir-825-c1-squashfs-sysupgrade.bin
And all it's now rock-solid again.
The same instability occurs on all 3x routers, so a hardware issue seems unlikely. I have yet to identify if there is any particular action that causes it to get confused. Sometimes only WiFi is affected. Other times existing LAN and WLAN connections are maintained (say, streaming music), while new ones time out.
First, can anyone else confirm similar experiences?
Because I'm WFH now, I can't switch back to ath79 until the weekend, so I don't have any ath79 sys logs. Is there any other information I can supply that might help?
Update: OK, so sorry if I wasted anyone's time, but it turns out it was an intermittent hardware problem.
I've got a HCF (hybrid coax fibre) connection in Sydney AU, and it took weeks of collecting data, but I finally managed to convince the monopoly who (er, um) "look after" that hardware (NBNco) to come investigate the problems I was having. Bottom line, after replacing one slightly corroded RG6 connector in the pit across the street with a shiny new one (with a gasket!), the problem has disappeared.
So, in summary, 19.07.3 was working all along - certainly on ath79, but very likely on ar71xx as well.