I have absolutely the same issue. Sometimes, after normal Windows boot, Ryujin LCD and fans work well. But sometimes, after Windows boot, the ROG logo comes to LCD screen instead of my parameters (CPU Temp), or fans doesn't start to work under load, and I need to open Armory --> Ryujin device, and then restart all settings. Why it cannot work smoothly every time???????
MB is ROG Z-590F
Firmware is the latest one