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.
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ASUS ROG Strix GL703GS, GTX 1070 8GB, 32GB RAM, 1920x1080 144Hz G-Sync laptop screen, external monitor UWQHD 3440x1440 Mi Monitor, NVMe 4x, 8BitDo Arcade Stick, EasySMX X10 controller, ROG Strix Carry mouse