This issue has been pointed out but mixed inside a bunch of posts. In the latest fast ring build 19476, it is worse and does not stop on its own. The major symptom is that the screen cursor on the desktop will flash a blue ring every second or two. Also the CPU usage is up around 8-10% while just idling. Task manager shows that the wsappx> appXSCV is using up the CPU cycles.
The solution is to turn off the Background Apps in the privacy button in settings. I think the new builds turn it back on every time there is an update in the fast ring.

here is the tutorial:
Background Apps - Turn On or Off in Windows 10 - Windows 10 Forums
Click image for larger version. 

Name:	Background Apps.jpg 
Views:	4 
Size:	316.3 KB 
ID:	106471