I suspect this is an issue with the 2nd gen scarlett drivers.
I've used CbB 2018.07 on 3 machines with a 2i2, 6i6 and 18i20 (all 1st gen interfaces) pretty heavily over the past month, and it's been rock solid for me on all machines at the lowest latency (1ms). It's a bit early to tell with CbB 2018.08 build 32, but so far it's not given me any issues.
The first thing I'd try, is re-installing the Focusrite drivers.
This may fix it, or you never know, this could be another Windows 1803 issue that's come to the surface with some minor Windows update.
If the problem still persists, try contacting Focusrite. They've released beta drivers for specific issues in the past, so you may get some joy out of them.