I had a strange issue last month where my printer suddenly started leaving faded lines across every page. I thought the printer was dying, but after checking, the real problem was the laser toner cartridge. Turns out I had installed it without removing all the protective seals properly. After reseating the cartridge and gently cleaning the contacts, the prints went back to normal. Another thing I learned storing toner in humid places can create unexpected print quality issues. Sometimes the smallest setup mistake causes the biggest printing headache.