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New RBK753S - Stability / wifi connection reliability issues every other day so far? (fw V3.2.16.22)
I recently upgraded to the Orbi AX / Wifi 6 RBK753S (from the AC3000 RBK53). I never had any real issues with my RBK53, but since my ISP plan speed just went up again, I wanted to maximize throughput...
Something to try out, Disable AX mode on the RBR. Just the 5Ghz radio or both. Up to you.
Also set CTS values to 2347. Then retest the killer adapter.
Then maybe re-enabled AX both and re-test for consistency.
Posting there here im my dedicated issue thread too:
The bad news is that this morning, the Speedtest speeds are again lower (not quite as low as before the factory reset, but they drop off DRAMATICALLY before the test ends: The test starts at 475 Mbps BRIEFLY but very quickly drops to 330 range and stays there - end result 337 Mbps only. 
Actual download speeds are also bad today via wifi (e.g. 170 Mbps).
Just conected the laptop to the Orbi ethernet port (no other changes) and instantly both Speedtest and real world download speeds are fine via ETHERNET, just about 480 Mbps (stable at 478 - 480), so it is Orbi wireless that is an issue.
So I can rule out all of the following: my ISP, my cable modem and the Orbi wired connection.
These poor wifi speeds in same room as the router are very disappointing and frustrating. I may as well go back to my RBK53 in that case...
I do not know if this is perhaps due to the router firmware or router. Doubt it is due to the wifi adapter though since 2 different adapters were unable to get proper wifi speeds.
Per another thread, I will try to experiment with disabling WMM on 5 Ghz band just to see if it has any impact. The problem is QoS is supposed to be enabled, so I will have to turn it back on.
Then I will try to go back to the 2.16.x.x firmware to see if that helps speeds...
Disabled WMM and wifi speeds went way down to 68 Mbps, so will IMMEDIATELY re-enable that after a call and then next step is to find time between calls to install 3.2.16.x firmware again...
Hope 3.2.16.x helps; if not luckily I still have my RBK53.
Shame, I really wanted to enjoy the Orbi AX wifi speeds on my further away wireless devices (have an AX laptop in the other room).
If all else fails, I may have to try another AX solution to compare its wifi speeds to the RBK753S...
What are you using for CTS values? Default?
Let us know how it goes with prior version of FW.