Can't really say about problems fixed, or new problems, as I haven't used this device for some time.
But I did try and put my D7800 back into use and installed the new firmware version to start with.
It didn't last long though, because it went so badly.
The R8500 as a wireless bridge didn't work, but the wireless bridge functionality on that is badly broken anyway, so I don't know if other Netgear routers will work with it as a wireless bridge.
Both the RT-AC5300 and RT-AC88U didn't work as wireless bridges either, and the iOS genie app saw not devices in the network map, but that app is frequently broken too.
I didn't have time to test a Qualcomm device as a wireless bridge to it either.
In the limited time I had it as my gateway I believe my household devices were functioning and the modem appeared function fairly well in terms of sync rate.
I can't be sure my household devices were actually working OK because I had to get this working again and couldn't spend the time.
Ian