The issue:
all of a sudden on 16 March 2020 I noticed that when I resume from Hibernation, the keyboard leds won't turn on, but keyboard still works and I can restore leds with ROG AURA Core... but at this point with led off after Hibernation, if I reboot the keyboard will totally stop working except Mousepad and Power button (it also keeps led turned off)! This persists even at BIOS and on next reboots!! Keyboard not working except mousepad and power button all the time.
To restore leds and keyboard I have to: Shutdown, unplug PSU, and press multiple times Power button...
I'm afraid it is a Windows 10 1909 issue after recent updates + ASUS software conflict of some kind. I tried to uninstall recent ones (got updates on 7, 11, 14 of March) but didn't help. Have no idea why this happened and hope someone has had similar issues and has a solution because ATM I can't use Sleep and Hibernation reliably anymore
😞I tried also to disable ROG Armoury II (I use for Carry Strix mouse) and ledcontrolservice3 but didn't help:

These are my (left) Win updates:

To recap:
Hibernation or Shutdown now make keyboard leds turn off "forever" even with next reboots. When leds are off only mousepad and power button do work.
To wake up keyboard (and its led, have no idea why they seem connected now) at this point I have to:
- enter Hibernation or Shutdown with power cable
- unplug cable and press Power button to resume laptop using battery: this will wake up leds and keyboard will work fine.
No idea why...
😞Gaming Laptop ASUS GL703GS (BIOS 310)
CPU i7-8750H (iGPU unavailable)
GTX 1070 8GB (non-Max-Q, 10DE 1BE1 - 1043 1011, GP104 A1, vbios 86.04.7c.00.24, Samsung VRAM)
Windows 10 Pro 1909
Desktop res: 1080p (1920x1080)
Screen: 144Hz + g-sync AUO B173HAN03.2 [AUO329D]
Audio: Realtek HD Audio (ALC295 chipset)
Hard disks: NVMe Samsung, SSD Crucial
USB Blu-Ray 4K drive: Archgon Star MD-8102P-U3YC-UHDB (Pioneer BDR-UD04)
// ASUS SCAR18 G834JY, i9-13980HX, 4090 laptop 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, Vader 4 Pro controller, ROG Strix Carry mouse.