Certainly, with wear and tear this can happen. The frequency that your teeth are chipping is unusual, though. As for possible causes, you may have developed a new habit of grinding your teeth, either during the day or at night. The grinding can weaken teeth to the point of breaking. This may also be due to teeth that have large fillings. As filling size becomes larger, tooth strength and structure weakens.
I would recommend having your teeth looked at and discuss your concerns with a dentist to determine what the underlying cause may be.