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Laptop does not wake from sleep / frozen black screen - w/ Intel UHD Graphics 620 driver

Star II
System: Windows 10
Battery or AC: Both
Model: Zenbook UX430UAR
Frequency of occurrence: 50-60% of time when computer sleeps
Reset OS: Yes, many times
Screenshot or video: N/A
Detailed description:
On Windows 10, I'm getting a black screen when trying to wake the computer from sleep or o just waking the display (if computer sleep is disabled).
The computer freezes completely and the only way to get it back is to power it down and back up. Occasionally (rarely), the keyboard will be lit solid or blinking in this frozen state. Also, the power led blinks .
If I leave the computer frozen for a long time it heats up considerably, especially if plugged in.
This is a work computer so no games and no overclocking. BIOS settings are defaults (BIOS has been updated to the latest patch, 308) .
Computer has been cleanly reinstalled a number of times and is currently on Windows 10 2004 with the latest patches.

Troubleshooting actions tried:

BIOS update to 308 (latest available)
Disabling all possible devices one-by-one in Device Manager (Wifi, BT, card reader, fingerprint reader, display audio, system devices, etc.)
Tweaking power options such as disabling sleep, hibernation.
Tested RAM and SSD OK - even tried a different SSD at one point.
Installing driver versions downloaded from ASUS website (chipset, graphics and others) for this computer (VGA labelled Coffee Lake) and for a very similar model UX430UA (VGA labelled Kaby Lake).
Trying different versions of Intel Graphics driver (UHD Graphics 620) from Intel website, ranging from version 21 to the latest available.
I've wiped and re-installed Windows clean already 6 or 7 times, to different versions, but the issue happens starts happening after the Intel driver is installed by Windows update.
BIOS was reset to defaults.
The only way I've found around the problem is to disable or uninstall the Intel driver, but that leaves me without brightness control, etc.
Please help!
Thank you in advance.

Star II
I'm on a UX533FD and the wake-up problem happens with every BIOS I've had. It started happening when I still had 300 installed from the factory and continued when I upgraded to 304 and 306 (which is the latest version).

Star II

Downgarding my bios from 318 to 317 has permenently fixed this problem for me. Its been 10 days, all good. Interestingly when the sysem wakes there is a slight delay (<1sec) that was not present wit 318.

Hope that helps.

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Is there someone reading with a 430 or 331 zenbook with perfectly working sleep mode ? If so please could you post your :
intel driver version
MEI version
MEI firmware
Win version?