Frigidaire Freezer Buzzing. The freezer started making an intermittent buzzing sound at the same

Question

The freezer started making an intermittent buzzing sound at the same time the freezer either defrosted or stopped operating. I turned the freezer setting to 0 overnight and then back to 5 the next morning. Things went well until the evening, at which time the same thing (buzzing, defrosting) happened again. I believe the fridge wasn’t cooling as well either, but didn’t measure the temperature.
Thanks for any help you may be able to provide.