The bottom 1-inch row of my Aspire S5 laptop randomly just started flickering every 3.5 seconds. I’ve updated Windows and tried rebooting and it’s still like this. The flicker also seems to “mirror” other parts of the screen (see the pic attached for what I mean).

Can anyone help to troubleshoot?
It’s really distracting to use the laptop with the frequent flicker. The laptop is less than 3 years old.
Thanks!