Not sure if this is related, but occasionally I'm witnessing screen becoming garbled - just for a split second. This sometimes happens after each keypress. On other occasions, it doesn't happen at all.
I'm uncertain if this is some software problem, or if this is caused by keypresses causing vibrations on the display connectors or something.
E.g. if I open Firefox and start typing some search terms, it happens. This is only happening on occasion, and I have not really seen a pattern. If it becomes too common, I'll try to record a video (using some other device) and extract the frames.