Burr, sag or something like that

[cliffyk]

it is most likely that the LCD shutter has gone bad--it is a "consumable" component (a "wear item") and typically wear out after 250 to 300 hours of printing. You can read more about how the shutter works and why they wear out in my post here.

If your printer is a year old and you have not yet replaced the LCD I guaranty that is the problem--in fact so does Elegoo, thay only warranty it for 3 months--from the owner's manual: