Since I also made the experience, that QC Control is running pretty unstable (at least reoccurring connection issues) on MacOS (Sequoia)…
Think, I found a potential problem maker - USB hub as intermediate hardware.
Now, I connected my QC device directly to the MacBook (using a UGREEN USB B to USB C cable). Looks like everything runs very stable.
What about your experience?
@support@neuraldsp.com Maybe something to investigate?
it’s been pretty well-documented that hubs are NOT recommended for using w/ the QC. Some of us have had success with self-powered hubs, but they’ve been very clear in the Manuals and instructions to avoid using hubs where possible.
I have exactly the same issue. Removed the HUB from chain, it became a bit more stable. But still with occurrences of the issue.
Maybe the USB B to USB C adapter.
I would doubt what you say about this…not saying it is not real what is happening to you, but not sure the QC is the issue…
I have numerous USB devices connected to my pc and connected to the same row of USB inputs/header… Also the QC is running into a USB 3 (cause I don’t have any USB 2) input and have used as an interface several times and it has being faultless, same with cortex control… I can not fault anything…
But the QC may not be the issue here… What your plugging in mite be the culprit and you can’t blame the QC for this my opinion… You have gone from months to days on the testing part 
maybe the stuff your plugging in, is just bad
As said I’m not saying your not having real issues… But I don’t have any noise issues and I go out 3/4 into my audio interface… So my grounding is the same as yours we both using a QC I’ve 2 monitors running I’ve an interface going while QC is plugged in by USB aswell, I’ve dongles external hdds running USB lights USB light guitar ornament studio monitors not USB but running and this is all sitting on the same desk eccept pc is under the desk…
Cables running everywhere lots of them although nice and neat and the QC does not flinch… Maybe you need to dig further into why your having this problem
And just cause you unplug the USB cable from the QC it doesn’t mean the QC is the issue
Whatever? is a childish reply… I was only helping you in saying I don’t have a noise issue and that QC may not be your problem… I was waiting for you to possibly have a light bulb moment but I guess not… There’s lots of reasons for these kind of problems…have a nice day too
I always (yes, always) have to start CortexControl 1.1.1 on Macbook pro - OS 15.0.1 two to three times, have tried the connection with hub, but also directly with USB C cable. Either a direct crash or the charging process is not completed. Reinstallation did not help. However, the direct connection with a USB C cable is definitely the more stable option when the program is running.
I made observations, making me think, that the memory management of CortexControl is leaky and crappy.
Why?
Because closing programs on Mac seems to improve stability.
Guess NeuralDSP should hire some really professional software developers for Mac and Windows… 
After installing CortexControl 1.2.0 on the Macbook pro (OS 15.2), all stability issues have been resolved.
I have not noticed any loss of performance, lagging or anything similar.
Is your system up to date? Cable between QC and computer okay? No USB hub connected in between?
best Jo