This issue can occur with wired Nest doorbells. It shouldn't affect battery-powered Nest doorbells when hardwired to the chime.
“Phantom” ringing that happens at random times is typically due to fluctuations in the voltage sent to your chime. While small power spikes usually won’t trigger the chime to sound, larger ones can. This might happen when your Nest doorbell activates night vision.
- Temporarily disable Night Vision in your Nest doorbell settings.
- Check the voltage and upgrade your transformer. If you need assistance, contact a local professional.