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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...
Are you connect at the RBR or RBS when wirelessly speed testing?
Does this happen on more than one wireless device?
What channels are you using?
Any wifi neighbors near by?
Would be good to test a older version of FW to see.
FURRYe38 wrote:Are you connect at the RBR or RBS when wirelessly speed testing?
Does this happen on more than one wireless device?
What channels are you using?
Any wifi neighbors near by?
Would be good to test a older version of FW to see.
Using RBR for wifi tests.
Similar results with a Note 9 on 5 GHz 802.11ac
Both devices (laptop and phone) located only 1 - 2 feet from RBR.
Wired speed was instantly 480 Mbps with same laptop. I did not do anything else, except connect to the Orbi's ethernet port... (did NOT even need to reboot laptop or renew I lease etc.). So it is not my ISP or cable modem etc.
Disabling Orbi's WMM made things even worse (perhaps a good thing, since that was only to check if that was the cause; I do not want WMM disabled permanently anyway).
Next step is to try 3.2.16.x
Problem is the issue tends to happen after a while, so I may think 3.2.16.x helped and only find out a few hours later or even half a day later that speeds are down again...
For example, after the factory reset last night, I got 5 consecutive tests with high speeds (as noted last night) and was hopeful it was better.
Before the reset (per Speedtest results history), I could only get 1 - 2 (max) good tests in a row before speeds dropped again on 3rd test and beyond.
But this morning back to the drawing board - the lower speeds I noted in my posts above. :(
Best testing for wifi would be 6-10 feet from the RBR.
FURRYe38 wrote:Best testing for wifi would be 6-10 feet from the RBR.
Very true (overloading was a potential concern), but this laptop (17" desktop replacement) is fixed (connected to 2 24" monitors etc.) and a pain to move. Also since it worked fine (in same exact location) for 5 consecutive tests right after the factory reset, something else appears to be at play and distance will not help.
That being said, I will take my smaller and much lighter laptop (with an Intel 'AX201' Wifi 6 / AX adapter) and test that in this same room in a minute and report back with results...