OnePlus is facing criticism for its constant display issues, such as a permanent green line on the screens of some models running Oxygen OS 13, and overheating. The problem was first noticed several years ago and has now appeared in some models, including the OnePlus 9, 10, and 11 series. The users feel that the green line might be caused by software bugs or hardware malfunctions in the AMOLED displays. While OnePlus has admitted to the issue and has even provided free screen replacements, the overheating remains unsolved. As people become frustrated with these recurring problems, they ask for better support, repairs, and transparency from the brand regarding such issues.