Cubase Artist 10 stops outputting sound

I have a persistent problem in Cubase Artist 10. The program runs fine upon opening, but after some time (the amount of time varies quite a bit—could be 10 minutes, could be an hour) the program stops outputting any sound. The playhead will move; I can still save / edit / execute commands within the program. But no sound. Sound returns if I close the Cubase and restart it.

I have already uninstalled and reinstalled and I’m having the same issue once again.

Any ideas?

Thanks,
Phil

Cubase Artist 10.0.50 Build 301
Scarlett 18i8 (1st Gen) audio interface
Focusrite USB Asio audio driver (version 4.63.24.564)
Windows 10 Home, Intel Core i7-9750, 16GB RAM