Usually Samsung compressors are very quiet. Noises are mostly from the fans. If your refrigerator gets noisier over time you might have a defrost problem or a defrost drain problem. Either issue causes ice to form and eventually it reaches an evaporator fan and makes noise when the fan blade hits ice.
Next time you have to unplug it, leave it unplugged for at least 30 minutes with the refrig doors opened and remove the big back panel in the refrig compartment. It's very difficult to remove when refrig is cold. I suspect you'll find the defrost drain is blocked. Pour boiling water down the drain to unblock it or use a hand-held steam cleaner to blast it free.