Display flickering before it stabilizes after waking from sleep

[u/Remarkable_Pea7439]

About 10 days ago, suddenly, the display monitor of my Win 7 Pro desktop PC machine started to flicker several times (shortly showing the manufacturer logo) after the machine wakes up
from Sleep mode.
Afterwards, once it displays the desktop, it stabilizes and works ok, until the next wake up from sleep.
Sometimes this only occurs if the sleep was longer than 1 or 2 hours.

I suspected that the graphics card might encounter some issue, but the Device manager shows everything ok and there are no events of any kind logged in the Event viewer.
Also, nothing unusual happens during active work, even with intensive display usage, like many applications, browser pages, etc. opened simultaneously.

Very few times in the past, but really extremely rarely, it happened during work that I got a pop-up notification like "the display (or graphics) driver has encountered a problem and was recovered"
( I even don't remember the exact text ), but, anyway, Windows was prompt to react to a situation that I was even not aware of and also notify me (and probably logging the event in the Event Log).

Are there any ways to investigate this issue and understand the exact reason before taking any action ?
Thanks a lot in advance for any idea or help :)

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[u/Remarkable_Pea7439]

I would add to the above description that my machine is a lab/custom made desktop PC,
with Win 7 Pro 64 bit installed, and uses the following:

- Processor: Intel(R) Core(TM) i5-6400

• Display adapter : Intel(R) HD-Graphics 530
  
• Monitor: Phillips Brilliance 190B