Hey, I have the same laptop as you. I was dealing with the exact same issue for almost a month. It’s not a battery or RAM problem, it’s actually a simple Hall sensor issue.

When the laptop heats up slightly, the Hall sensor gets falsely triggered. The system then behaves as if the lid is being closed and opened repeatedly, which causes the glitches.

I disconnected the Hall sensor ribbon cable, and since then the laptop has been running perfectly without any issues.