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Can anyone explain this really weird problem?

Level 7
I recently got a PG349q. Looks great. However,

I have a problem with it constantly refreshing, during games sometimes, or when I load up programs. I can recreate it whenever I minimise the Nvdia control panel. It will refresh twice, going to a black screen for a brief second.

I am running the monitor as a duplicate to my laptop. I have the laptop closed during this, and I am connecting it to the monitor via Display Port. This problem happens at any refresh rate setting and any resolution.

BUT: when I leave the laptop up, I do not get this problem.

Anyone know why this is the case? and is there any solution to this? I would rather keep the laptop closed, so it is not a distraction, and doesnt take up as much space.