why is NHL 18 the only game that my PS4 wont read

@Marlee66689 Hi, it sounds like the disc itself is damaged/dirty. Perhaps if you try a disc cleaning/repair kit that may help. 

If you're having hardware issues on 2 consoles in a row, you may want to check for environmental factors. Be sure to check that the system has sufficient airflow, and that its vents aren't clogged with dust or animal hair. If the vents are blocked perhaps the system is getting overheated, leading to damage. 

Thank you.