This bug has never been solved, even with
ROG Aura core service 3.02.58 (2019/02/12)
and latest ROG Aura (UWP) from MS Store.
If you're used to not reboot/shutdown your PC and use sleep+hibernation most of the time, randomly after a few days the service won't work anymore and you have to "resume" it launching the ROG Aura UWP.
// ASUS SCAR18 G834JY, i9-13980HX, 4090 256bit 16GB, 32GB 5600MHz RAM, 18" 16:10 2560x1600 240Hz G-Sync internal screen, external UWQHD 3440x1440 Mi 34" Monitor with Freesync, NVMe, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse.