I just wanted to update this thread on my experience.
I have already added my issue here, previously. My screen shakes begin from the top edge, after 4 or 5 lines first form. THe time from startup to the first shakes is approximately 20 minutes. After the first shakes appear, they get worse and worse till screen
content is unreadable.
However, over last two days, Ive noticed something weird. I left my screen on for hours despite the shakes, since I decided to cast its content to the TV via chromecast.
The casted content on TV DOES NOT shake at all, and is fine, but the SP4 screen will be shaking. After an hour, the shaking abruptly stopped. Yes, I repeat, the shaking stopped. I was pleasantly surprised at first, so decided to replicate this.
Today, I replicated this for a second time. I put it into battery saver mode and left the screen on. THe shakes began after 20 minutes of usage and continue for 40 minutes, after which they abruptly stopped. The screen is back to being perfectly stable. I am
typing now after it self-corrected.
My doubt now is that the issue is actually a self-correction effort by the screen to resolve a few dead pixels near the top. This is just a guess, but we may need to look into either disabling this self-correction mechanism or figure out what's causing these
dead pixel lines.