Hey, so I had the same issue on a Macbook pro (M1) where every so often the screen would flicker, black out and show only those exact vertical lines and so I took it in for repair (in warranty, otherwise repair is ~£500-£1000). It seems to have been a hardware issue as when I mirrored the display on a second screen, it worked but only on that screen (I advise you test this too so that you can point the repair person in the right direction as it's not a common issue, it seems). So the team at Apple replaced the screen and left it running for a few hours - it's been a few days and so far, no more blacking out and lines.
Just to note, the issue I had would sometimes "fix itself" and not show for hours, which is why I left the issue for 2 months before the issue finally became more of a permanent thing. However, first time I sent it to Apple for repairs, they only checked it for a few minutes, couldn't replicate the issue, then sent it back untouched.
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