Question ASUS GT-AX11000 Dropping Connection

[ChuckRoast53]

I hope this is the correct forum - I couldn't find a "router" forum! I have an ASUS GT-AX11000 router, with an RP-AC1900 extender. For the first 8 months this setup was rock solid. I have 34 devices connected, and speeds are excellent. Now, at least daily, and occassionally 2-3 times daily, the router completely drops the 5 GHz channels. They are not discoverable, but the 2.4 GHz channel is still there. Wired connections also are offline at this time. A reboot seems to resolve this. I shouldn't have to reboot a router daily in order to maintain wireless connectivity. Has anyone else experienced this? Is there a resolution? And if not, please direct me to a more stable router (or AIMesh configuration) that will be more trouble free.

 

[ChuckRoast53]

As an FYI (since no one posted any resolutions or suggestions):
I updated the firmware on the GT-AX11000 and the RP-AC1900. It's now been 7 days with no further 5Ghz channel problems. Strange that the connectivity problem just suddenly started even though it had been stable for many months.