Zenbook UX433FA - backlight starts flashing after a period of Sleep

[jr_edge]

System: UX433fA Windows 10 v 2004 (though problem around for some time before)
Battery or AC:
Model: UX433FA
Frequency of occurrence: most times I go into sleep mode
Reset OS:
Screenshot or video: n/a
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Detailed description：
* When I stop working on my desk, I press the Power button to put the laptop into sleep mode.
* When I come back later sometimes the keyboard backlight flashes on and off, frequency about once every one and a half seconds.
* Disconnecting HDMI cable and USB-C connectors does not affect it.
* Only reliable cure is a full shutdown and power on again.
* It continues if I use the regular Restart

[Blake_ASUS]

Hello jr_edge,
When did this start to happen? after you update to Windows V2004?
Does you laptop wake up from sleep fine? and after wake up it backlight continue to flashes?
Which BIOS version are you using now?
Thank you.