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 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