Screen goes dark intermittently

Formerly very occasionally, more frequently of late, I will be working away om my laptop and the screen goes dark. My workaround is to close the lid to put it into sleep mode and then resume Windows.
My screensaver is set up to go dark in two stages over several minutes, first dim, then dark, so I don't think it is related to that, as when this problem occurs the screen goes black instantly.
Later: the last time I just let it sit and it went into hobernation on its own. When I hit the power button Windows came back up. Maybe it's a power issue; I am going to check the diagnostics.

The battery is fine -- 98% Charged. The more I look into this the more I think something is prompting the latop to go into Hibernation mode without me asking. But what?

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