Infiniti fx35

Full option, double opening sunroof, seat heating, electric seat screen, traveled on it back and forth, no problem at all, suddenly a sound appeared in the engine like a knock, it comes and goes, the sound is not constant, and I don't know if it's knocking or something minor, there is slight tire wear, the registration is renewed for approximately 5 years, the engine is tight, the transmission and engine are in original condition, not worn at all, but only this sound that appeared, engine mounts are fine, above average, inspection has expired, and greetings