[Coda]

I wouldn't sweat it. Intermittent graphical glitches like that are kind of annoying but unless they're so frequent that it interferes with your ability to use the computer it's probably better to just deal with it. If it's a one-time thing, just shrug and move on.

If it is a driver issue, you can try newer GPU drivers (if they exist) or older GPU drivers. It could also be a transient hardware issue; I've seen that come up with overheating before, for example.

Otherwise, it could be hardware damage, perhaps due to water (even a single drop can do it if you're unlucky) or dirty power or overheating for too long. This can sometimes be repaired but it's kinda expensive because laptops are really annoying to service and you can't really just swap out parts like you can in a desktop.

But really, odds are it's something you can just ignore.