The treadmill has a bunch of parts & pieces, and one of the most popular 'home fitness' exercise machine that requires the most maintenance. Maintenance of a treadmill would include: cleaning the motor cover, testing the stop/start button, checking lubrication, testing the tension belt, and tightening all the loose parts.
If it is a true/false question. Answer would be true. Some people never show symptoms, others show them within 7 days and for others it shows in about 30 days.