Im sorry you are having this issue.
I have just tried to replicate this on PT4v.4.15.38 and NC.v.2.9.9019.
I could not replicate this. Played a few spin n go and HUD worked fine, NC did not stop. This tells me its not happening to everyone. Also from the previous feedback, the issue is associated to the latest PT4 update.
To try and fix this lets try and reinstall Notecaddy.
-Move the folder in this location to your desktop to act as backup: C:\Users\Yourusername\AppData\Local\PokerTracker 4\Data\AppsData Move not copy the Notecaddy folder usually called "Tm(and some numbers)" to your desktop
-Restart PT4 and reinstall Notecaddy
A fresh install of NC might fix this as in my case its working as expect.
Hope this helps.
Shout out if you need any more help