@R1D2 

-56 dBm at the position of the above speedtest on the 5ghz band. 

Thank you 

@R1D2 

2.4: I've logged it as -47dB to -57dB 

But i've also logged 5ghz rang from -48dB to -56dB 

I'm not 99% certain this instability is down to these devices erractically swapping from 5Ghz to 2.4Ghz, sometimes so often, it is mid speedtest. This ping pong seems to go back and forth many times. 

I made a mistake in my opening post suggesting that i had disabled 2.4ghz and jitter was still happening. I actually realised there was another nearby 2.4ghz AP broadcastign too. 

Since then i've turned them all off and running 5ghz exclusively. Every single test has reported <1ms jitter. 

So i'm pretty confident the instability is erractic swapping between 2.4ghz and 5ghz. I dont know what is causing this. Wether it is the latest firmware or IOS14. 

I've tried enabling band steering but it didnt change anything. 

@R1D2 

Thank you I have In the end separated the SSIDs and therefore won't be using band steering, 

I am still observing very strange behaviour with devices ping ponging between APs, now over 5ghz. 
 

I admit that this environment has very few slow/weak spots coverage wise, so some devices might be in range of 2 APs (on different channels) with relatively similar signal strength. I suppose that is what causes the devices to keep rapidly changing their AP of choice. 
 

For example I just moved from one zone to another and saw the device connect to the closest AP, then back to the original then to the closest, then to a completely different one (second closest) before finally settling on the closest. All within 30 seconds. 
 

very bizarre, perhaps this has always happened and I just haven't been looking. 
 

Point being, now I've separated the SSIDs I no longer have this rapid switch between 5 and 2.4, the instability and jitter caused by 2.4 is gone, although still present and unavoidable for 2.4 only clients. I do still have devices rapidly switching between APs but now only on 5ghz. Whilst this happens speeds do fluctuate, but no wild drops or pauses as 2.4 is no longer a factor, until the device settles in the strongest connection. Perhaps this is normal, or maybe ios14 is more sensitive to choosing an AP. It would be interesting to know if this has always been the case or wether the new firmware of ios14 is magnifying the issue. 
 

Im happy to keep SSIDs separate for now, although not ideal. Shame really as it's worked relatively flawlessly for a long time now. 

Hi @bp1000,

I was having very similar issues!  Unfortunately, I was making a lot of seemingly minor changes at once to my home network and I never did track down the real root cause of the issue.  Then it mysteriously went away.  I also do not use band steering, all of my iOS devices are on 5.8GHz.

Where I first noticed it was with SpeedSmart.net.  This benchmark generally gives me the best speeds, but all of a sudden was reporting speeds like 40-70Mbit/sec as you mentioned.  But Ookla Speed Test and Fast.com were "generally normal" though perhaps a bit slower than usual.

At first I thought it was something amiss with this one benchmark test.  But the web version of it (vs. iOS) seemed to be working fine.  And it seemed to be working fine (from iOS) via cellular.

First I thought it was my new router.  But I switched it back and it seemed to persist.  Then I thought it was a bad network cable / switch -- this may have been a contributing factor for my son (who is hardwired).  Finally I thought it was some change in config/behavior/performance between the older EAP225's I was replacing with new EAP245's.

Of course iOS was changing at the same time, too.

I know, I know, 10 demerits for changing multiple variables at once.  But with the kids and wife schooling and working from home all day, I only get a brief window from 11:30pm until I go to bed to make and test changes.

It's strange though I was on iOS14 for at least a week before making these changes and didn't see any issues.  I don't know if it was 14.01 that did it, or something else.

-Jonathan