Follow-up: It seems that overheating is not the issue. LCD fails to start but after several attempts you get it working. At the beginning only the screen fails, the menu responds just fine. After you get it up&running everything is fine - no blackouts.
So the temporary solution for now is to plug/unplug the power cord, until you get the screen working. Obviously I deal with a faulty electronic part, but it wasn't identified after the visual inspection. Not yet

An alternative solution would be to leave the monitor always on...
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